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Smooth-On Alja-Safe™ Lifecasting Alginate Molding Powder, 3-lb Box

4.6 4.6 out of 5 stars 1,144 ratings
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Purchase options and add-ons

Brand Smooth-On
Material Plaster
Item Form Powder
Special Feature Non Toxic
Color Pink

About this item

  • Certified Skin-Safe Alginate - Perfect for Making Single-Use Molds of body parts (hands, feet, face, etc.)
  • Easy to Use - Simply Mix 1 Part AljaSafe Powder with 1 Part Warm Water (80° F/27°C) (by volume) to make a mold - cures in about 8 minutes – follow instructional videos!
  • Pour plaster, resin, gypsum & more into Alja-Safe Molds to make detail-accurate castings
  • NO Crystalline Silica!
  • NOTE: Not suitable for Dental Applications – Always Follow All Warnings & Instructions

Customer ratings by feature

Easy to use
4.4 4.4
Value for money
4.2 4.2
Accuracy
4.1 4.1
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Product Description

Smooth-On
Alja-Safe

Safe to use Alja-Safe is the world’s first alginate molding powder that does not contain crystalline silica (a known carcinogen). Alja-Safe is perfect for making single-use molds of the face, hands and other body parts. It captures detail better than other alginates, giving you a more accurate reproduction of your original.

Certified Skin Safe - Material is skin safe and certified by an independent laboratory.

Alja-Safe is easy to use and cures quickly. It reproduces fine detail and makes an excellent temporary mold – good for one or two reproductions of any body part. You can then cast plaster, gypsum, platinum cure silicone rubber, or Smooth-Cast 300Q ultra-fast urethane resin into the mold to make a reproduction.

For making reusable molds of any body part, use Body Double silicone rubber. Visit Smooth-on website for more information on lifecasting and what these materials can do for you.

IMPORTANT: This product has not been tested for and should not be used for dental applications.

Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question. Refer to technical bulletin for more information available at Smooth-on website.

Smooth-On Plaster Casting
Alja-Safe Plaster Casting
Smooth-On Applications
Alja-Safe crystalline silica-free alginate

Product information

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Product Warranty: For warranty information about this product, please click here

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Smooth-On Alja-Safe™ Lifecasting Alginate Molding Powder, 3-lb Box

Smooth-On Alja-Safe™ Lifecasting Alginate Molding Powder, 3-lb Box

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
1,144 global ratings

Customers say

Customers like the quality, fun, and ease of mixing of the bonding adhesive. They mention that the instructions are easy to read and intuitive. They are also satisfied with the detail, and value. However, some customers report that the product takes time to master and the set time is over 10 minutes. They also mention that it dries out very fast.

AI-generated from the text of customer reviews

156 customers mention134 positive22 negative

Customers like the quality of the casting material. They say it's wonderful, perfect, and works great. Customers also say it produces high-quality casts and is easy to use. They mention it'll work well for their first time using it.

"Great product for making molds of any thing you want. Ive used it for making molds of different lure designs and they have all come out great...." Read more

"...The half cast came out perfect. The detail it captures is amazing...." Read more

"...of our newborn baby son's feet as he grows the first year and this has worked well!..." Read more

"Super awesome stuff! Very first time using this for my husband and I and we really didn't know what to expect...." Read more

73 customers mention68 positive5 negative

Customers find the bonding adhesives very easy to work with, especially for beginners. They say the instructions are easy to read and intuitive enough to begin experimenting with. Customers also mention that it mixes up well and is easy to case plaster figures. They also say there are tutorials online that will let them know how much they need to mix.

"...The instructions were very informative and helpful in guiding me in obtaining good results. There is enough material to do several pours...." Read more

"...and the instructions seem fool proof...." Read more

"Very easy to use alginate!..." Read more

"...Alja-safe before in high school, and remembered how easy it was to case plaster figures, like my hand, face and elbow for interesting projects...." Read more

23 customers mention23 positive0 negative

Customers are impressed with the detail of the bonding adhesive. They say it captures every detail, even the tiniest ones. Some customers even say the product picks up every tiny detail perfectly.

"...The half cast came out perfect. The detail it captures is amazing...." Read more

"...Details are ok, not super fine, but well within expectations" Read more

"...I make a cast of my hand with this stuff and the detail is insane, literally every single crevice and pore of your hand is captured in this material...." Read more

"...Picks up every tiny detail perfectly...." Read more

21 customers mention21 positive0 negative

Customers find the alginate fun, interesting, and satisfying to work with. They also say it's versatile and easy to use.

"I got a cast of the kids hands and cast some other stuff. It's fun stuff to play with...." Read more

"...She is hoping to use with a Summer Art Camp since it is such a fun project." Read more

"This alginate is quite easy and satisfying to work with. I bought it to do a full cast of my head with the help of some friends. We had a blast!..." Read more

"...It got a little messy as it was my first time using it. Super fun to work with and easier than I thought...." Read more

20 customers mention14 positive6 negative

Customers like the value of the bonding adhesive. They mention it's very cheap.

"First molding material I ever bought. The price is reasonable and you get enough to mold one big thing or multiple small things...." Read more

"...you instead will have to start over. although it is several times cheaper that silicon, I would only recommend it if you don't need to use the mold..." Read more

"I don't like the inconsistent pricing of the product I've Seen It Go from $32.88 2 / $58 in the span of about 10 days...." Read more

"...You get quite a bit and it's worth the money." Read more

14 customers mention0 positive14 negative

Customers find the bonding adhesive difficult to use. They mention it takes time to master, has a slow set time, and needs to be used fairly quickly. Some say the instructions are vague and the product has s hard time bonding to itself.

"...Shipping was quick and came right on time. The instructions were a little vague on things like "add all of the powder at once to all of the..." Read more

"...Turned out pretty nice. The set time was a little longer than I would have liked but I believe that can be adjusted by altering the temperature of..." Read more

"...This product needs to be use fairly quickly, the shelf life is not that long and once its expired, not sure if it has any other uses...." Read more

"...it has a hard time bonding to it self. this means if not enough is used you cant just add more. you instead will have to start over...." Read more

5 customers mention0 positive5 negative

Customers are dissatisfied with the drying time of the product. They mention that it dries out very fast, and some say the product is half-dry after 2 minutes of mixing. They also say the mold continues to dry, shrinking and distorting it.

"...unlike silicon, alginate has only one use since it dries out very fast. it has a hard time bonding to it self...." Read more

"...alginate daily this stuff puffed up an even after a week did not release moisture" Read more

"...I did. Product turned out chunky and half dried after 2 mins of mixing...." Read more

"Cannot mix this by hands, otherwise it will dry fast without getting fully mixed. MUST use a batter machine to handle this." Read more

Love It!
5 Stars
Love It!
Very easy to use alginate! Included a reference chart for how much to use for each part of the body which was extremely helpful for beginners.Cure time is fast, but I slowed mine down by using slightly cold, filtered water. Picks up every tiny detail perfectly.Bought a few boxes to take multiple castings of a pregnant belly and they turned out great!As mentioned before, the chart is extremely helpful, but it doesn’t include any references for pregnant bellies, but stated a full torso would only take 1.5lbs. Since I bought extra, I decided to try 3lbs just to be safe since I was dealing with a larger belly. What a waste! Not only was it waaayyyy too much, it was too heavy & the mold didn’t turn out right due to the excess weight.Tried again only using 1.5lbs and was a perfect amount for doing a cast with both parents hands on the belly. The mother wasn’t too big compared to most pregnant women so when it came time to just do just the belly I only used a pound which was plenty.I’m very pleased with this product and will now be my go to product for future projects. Easy to use and clean up.
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Top reviews from the United States

Imchasinyou
5.0 out of 5 stars Ignore the nay sayers. This product is easy and fun to use.
Reviewed in the United States on June 4, 2017
Verified Purchase
Great product for making molds of any thing you want. Ive used it for making molds of different lure designs and they have all come out great.
I see several reviews saying the product is crap and others saying do not buy it. All I can say is that your doing it WRONG! If you use warm water, you already screwed up. The water at 80 degrees actually feels slightly cold to the touch. The warmer the water, the faster it sets up. 50/50 mixing ratio is a bit off for my liking but that's my opinion. I like to add an extra ounce or so of water to thin it down a bit which produces excellent details and pouring ability. Ive done several molds from this package including hands, feet and a face and still have some left over to play with.
The trick is to find a water proof container just slightly larger than what your casting so you use less product.
I use old lures melted down in an old microwave for my lures. This product hold up very well. If you cast a larger piece, you will see steaming and bubbling of the melted lures but in the end, when its cool, you still get excellent results and very few bubbles.
Please, do not be put off by the negative reviews. Not every one can read and comprehend the instructions. Some people do not even try something small to see how the product works before trying the actual project. Ive yet to screw up one single project.
22 people found this helpful
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A. Smith
5.0 out of 5 stars Great product! I will buy again
Reviewed in the United States on April 14, 2016
Verified Purchase
Product was delivered on time and worked as promised. I used this along with plaster bandages (ACTIVA Rigid Wrap Plaster Cloth) to make a half cast of a models face. The half cast came out perfect. The detail it captures is amazing. As a professional special makeup effects artist, I am very pleased with this product. I've never been disappointed by any Smooth-on products.

Note when using this product:
-The warmer the water is the faster it will set up. I like to used cold water to give me more working time.
-You need to work quickly, it goes from a creamy texture to a solid before you know it.
-Cover the model's eyebrows (or any facial hair they want to keep) with vaseline. It will take your hair out.
-If used on the head, cover the model's head with a bald cap (it will take your hair out)
-After a few hours the alginate will start to shrink and dry out, so be ready to more whatever plaster or resin in the mold as soon as possible.

-Shrinkage can be fun! I got the alginate off the plaster in one piece (yeah! that doesn't always happen) and saved it by placing some very wet paper towels in the alginate so it would shrink without cracking. I checked on it every day. After a few days the face impression was about the size of my hand and slightly warped. I poured plaster into the smaller head mold. The result is a plaster cast of a slightly "S" shaped, shrunken head. It's just a fun, weird conversation piece and it totally freaked my model out (so it was worth the time). If you have extra time and extra plaster.... and you like weird stuff. :)
21 people found this helpful
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techieteacher
5.0 out of 5 stars Great for beginners and intermediates...
Reviewed in the United States on August 15, 2017
Verified Purchase
Update: I have now used this product for over a year and it still works great. I'm on to cold number 2 and I have made over a dozen casting from the one bag. Again it will depend on how buig your projects are as mine are infant's feet and hands. I love it as much as when I first bought it.

I wanted to make body castings of our newborn baby son's feet as he grows the first year and this has worked well! The one bit of advice I would recommend is making sure to dip the body part and pull it out and then put it back in to get rid of air bubbles. Also when filling with plaster pour slowly and rotate it around to fill all the little nooks and crannies before completely filling. The instructions were very informative and helpful in guiding me in obtaining good results. There is enough material to do several pours. I have done 3 babies feel and 1 set of clasped hands and one small test mix to test at the beginning using my thumb and still have enough for several more baby feet! I keep it twisted tied closed and in the box in a dry cool place and haven't had any issues over the past 12 months.
56 people found this helpful
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Rylie H.
4.0 out of 5 stars Totally will be doing again...with less air bubbles!
Reviewed in the United States on February 16, 2017
Verified Purchase
Super awesome stuff! Very first time using this for my husband and I and we really didn't know what to expect. We followed the directions (and by following I mean both he and I reading the instructions out loud multiple times) and the instructions seem fool proof. And just to make sure we understood the whole process we even watched a couple videos on YouTube.
For the sample mold I was going to do my finger in a little plastic container (a small Tupperware meant for ranch dip) and we figured out (after re-reading the instructions) that the warmer the water the faster it sets up. So the very first one we had to toss because it set up faster than we could get a finger into the container.
Second sample mold my husband just used his thumb. Same container and that mold came out good. (We made the water as cold as we could get it so we had time to mix and make sure his thumb was in there).
Thumb mold came out really good(it's kind of creepy how detailed everything came out)!
So then at 9:30 pm last night we decided to do our hand mold. I thought 3 lbs would be enough to get out holding hands and some of our wrists so that the finished project could stand a little taller.
I didn't have anything to really fit both of our hands (he's got a monstrous hand and I've got these petite but long fingers) so I just used the box (plastic bag inside). We used up all the rest of the product and finally after about 15-20 minutes we were able to free our hands out of the cast.
Lots of cleanup because we don't have any special tools that we were able to borrow from the shop without having to sterilize and clean (we work on a farm so instead we just used our hands to mix the Alja-safe in a bucket).
I ordered the alja-safe smooth cast 300q from another review I'd read and ordered the part a and part b VERY FAST SETTING in the shade of white. When it says it sets up very fast what it really means is that you've got about 5 seconds to get whatever air bubbles out before that stuff sets up.
Which we didn't have time to do. I'm only giving 4 stars because of my own personal reason that I wish the alja-safe could have the option in size for how much of it you want or think you'll need. And that the parts a and b came in a little bit bigger jugs then the 1 lb bottles that we got because with just mine and my husbands hands it wasn't enough.
That and this awesome stuff is on the pricier side of things which is why we just got it done and over with.
I am pretty pleased with the end result and it just takes some hands on to know exactly what you're doing and how to do it. I suggest having a third person helping like I wish my husband and I needed last night to mix everything or whatever.
Some air bubbles and some fingertips were lost because we didn't have time to get the air bubbles out before part a and b set up but end result is we've got a little sanding we'll do to make it stand evenly as well as get rid of some imperfections.

Awesome Mother's Day gift or birthday present.
Will be purchasing again in the future...and my mom said she'll be doing this with my 2 youngest siblings so I'll be helping them with that!
12 people found this helpful
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Top reviews from other countries

Twalls
5.0 out of 5 stars Shelf life of product not specified
Reviewed in Canada on September 15, 2018
Verified Purchase
Great product and so easy to use. Shipping time was okay. I ordered it than saw it for half the price a week later from the same company. Grrrrr. It is an excellent product even for newbies complete with full instructions website links etc. I will use this brand exclusively in the future.
2 people found this helpful
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Zack
5.0 out of 5 stars very good quality product
Reviewed in Canada on February 5, 2020
Verified Purchase
i like it and for sure if i need again i will order from same place.
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Karin
4.0 out of 5 stars Need to have water prepared ahead of time!
Reviewed in Canada on January 13, 2020
Verified Purchase
It works really well but you must work quickly! Small amounts are easier to work with than larger amounts so be prepared to practice before casting multiple hands.
One person found this helpful
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Dominic Lajeunesse
5.0 out of 5 stars Awesome stuff
Reviewed in Canada on November 12, 2019
Verified Purchase
Worked great! Exactly what I was expecting.
One person found this helpful
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Robert
5.0 out of 5 stars Good price
Reviewed in Canada on December 15, 2019
Verified Purchase
Quick Mold making
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