Smooth Cast® 300 Liquid Plastic Urethane Casting Resin - Trial Unit

Very good bought lots of this and will buy lots more easy to work with and great results all round

I had tried another brand of resin and had lots of issues with it not setting or only working with one type of silicone. There is no problem with this product; I mixed, pored and after 10 minutes had a perfect copy. Will use again.

Good buy. A little expensive. But works as moulds .u have to work fast and accurate

very good

This comes as two liquids which you mix together 1:1, and then pour into a mould. It hardens to a bright white plastic over the next few minutes. When you manage to achieve the correct mixing ratio, you get a smooth, hard plastic, indistinguishable from what you might get from injection moulding or similar. It's really good as long as you get that mixture right. Where it's not so good is when it's difficult to get that mixture right. I'm working with really small quantities, which means that any error in the measurements is a much larger fraction of the overall amount, which in turn means I'm less likely to get good results. It's very difficult to tell what you're going to end up with just from the liquid mixture alone. I've had a couple of pieces come out absolutely perfect, but I've had a lot of weird, sticky messes too, and the odd hollow shell. Another thing to bear in mind is bubbles. It's very easy to introduce bubbles to the mixture, which will ruin your piece if you don't get them out. The mixture is also viscous enough that it doesn't easily fill small holes in the mould, so you've got to be careful about making sure you get it in all the little pockets without trapping any air in there. Anyone experienced with this sort of thing will doubtless be fine, but as a beginner I found it difficult to get a consistent result. I think, if you can, it's probably best to work in larger quantities and do a lot of pieces at once, that way you reduce the risk of getting the mixing ratio wrong. It's a lot easier to get exactly 30ml of one liquid and 30ml of the other than it is to get exactly 5ml of each... Does depend on you having sufficient things that you want to cast though, and as a beginner, just starting to experiment with this stuff, I've only got a few things I'm interested in casting at this point. Next time, if I only have a few things to cast, I'll try to mix the liquids by weight instead of volume, and see how that works out.

This product is so easy to use, doesn't have a bad smell so can be used indoors. You do have to be quick so be well prepared with moulds to use

Perfect

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.

I used it to mold HO train parts. I mixed powdered pigment in one part and then mixed the two parts for a minute and poured. I had very few bubbles and I was able to reproduce some very fine details. The parts were ready to de-mold in about 10 to 15 minutes. I used a squeeze mold for some parts and an open mold for others. Both methods worked well. The product cures opaque white and adding black powder pigment gave me a finished product that was grey. I made about 200 small parts with this size. I used two separate syringes to accurately measure parts A and B then mixed them in a medicine cup.

My first time casting a mold. Works perfect. I recommend it.