Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit

Worked perfectly for my needs. Very little bubbling even when pouring it directly into a two-part thin walled cast squish mold with very little venting built into the mold.Even though my casted part is probably 1/8 of an inch thick at its thickest point, and probably half that at it's thinnest, this product is still very durable. Surprisingly. I was expecting I may needed to get the Smooth Cast Task series product over the Smooth Cast 300 to get what I needed for such a thin cast.First attempt at a cast I tried degassing the mixed resin. Spent one minute mixing. And one minute or so degassing. Which should have left me with one final minute of potlife. Nope, within a 3 second period between having my eyes on the resin in the chamber, I look back and see a very hot eruption of resin that instant cured into a soft foam in the shape of magma pouring out of the cup like a volcano lol. Lesson #1 learned. No degassing.First cast I used release (really just cooking spray) and black pigment powder. And it came out horrible. Finish was rough and textured, and the color was grey although I used a ton of black pigment. And ultimately it made the cast extremely brittle and it broke in two places while sanding/trimming. Lesson #2 learned. No additives, and avoid release agents (or at least particularly non-cast specific release agents).Without any additives or any release (still released perfectly fine without any chemical release) it came out very smooth and very durable.It also sands amazingly well. Doesn't clog up sanding paper, sands down powdery and easily.Also the cast was a motorcycle helmet spoiler that isn't sold separately anywhere. Was a very expensive handmade Portuguese carbon fiber racing helmet. I decided to learn about molding and casting and made myself a new one using a spoiler to the same model I bought for my girlfriend as a gift. Think of, two birds one stone lol. Gift + master for my own spoiler. For my very first cast, being so complex as it was, and being such an amazing success.. I am completely happy with myself and the results of the various products I've used. Will say though, silicone mold making is definitely much more difficult than the resin casting process haha. Especially two part molds making with non-flat masters.

Product meets my needs..I make artificial skulls and they demold and air bubbles free, bright white and the right hardness to accept all thread rods for attaching my antlers

I have used this company's materials before and they come through once again with a perfect product for my uses, casts cleanly and with few air bubbles - the 1 to 1 mixing ratio is easy and convenient - fast shipping and reasonable price.

Well I do not know what "sheerness" means except perhaps get a better writer. It is strong and for me easy to use. Of course I mostly use injecting into molds (Larger hypodermic syringes') but one can pore it as well. I have used Smooth Cast for about 10 years now and I have not seen another product that is it's match. I also use dye to change the color, mostly black. I also like the fast cure time (10 min). The plastic can handle negative curves in complex molds. I also like the cleanup as simple alcohol cleans out the the syringes and injector tubes. Great product. Now if someone will explain to me what "sheerness" means?

Only reason for 1 less star is due to finding out how crazy toxic this is to begin using properly.Gotta to basically be in a full-gear hazmat suite w/ goggles & respirator so y'all know. Can't have it touch skin, no fumes in your eyes, mouth etc. Which is why I mention the extreme hazmat suit. Be sure to have it in a very well ventilated room as vapors from curing are toxic to breathing aka circulated/recycled air in the house is something that needs to be considered. Having a detached garage or building for this product with fans, safety gear and the works is the best corse of action. I have it still but am so afraid of touching it due to these toxic qualities it has. So yeah, prepare your living area properly, get All needed PPE (personal protective equipment) aka 100% hazmat gear... rubber gloves, respirator, goggles, safety suit... detached or dedicated workspace that doesn't risk your home's safety etc. The product itself? I have no doubt that it is epic once cured for its high, professional quality. So no qualms on that aspect!

By far the BEST from SmoothOn. At this time I have to say that SmoothOn is a good company. Thanks Jeremy for your help. Also the pricing at Amazon for the trial units is cheaper than the manufacturer (SmoothOn) or anyone else.Now, for the comparison: SoothOn has the ONYX (Fast & Slow) which dries Black. Both the ONYX fast and slow are EXTREMELY finicky, troubled resins. They tend to bubble up on humid days and also develop BLISTERS (big blobs) due to heat. The ONYX if you must have black is fine for small parts.The SmoothCast-300 is a fantastic epoxy resin. BEWARE: It dries fast, very fast or within 2 minutes gets hard enough so it can't be poured. I started pouring in the mold and was left with the stream coming out of the cup running down the mold. It looked like those modern "Pouring in the Glass" sculptures. So, I CUT THE EXCESS, left what was already there, and poured a second layers to fill the remaining mold cavity. It ATTACHES well to the already dried resin. So, SC-300 LAYERS WELL and dries "VERY WHITE". It is EASILY SANDED, and behaves like wood. It DRIES IN 5 MIM. enough to sand it.By far, SC-300 is the easiest to work with between Onyx and SC-300. It is also hard and a bit flexible, almost exactly like plastic. In every way, it is real plastic. If you try to sink you nail into it, no way you can. I recommend SC-300 for anything dealing with industrial or commercial parts, which is what I do.

It is super easy to use. Dries super fast and picks up detail. Any flaws in the pictures are because of a mold putty I tried and hated.