Smooth-OnSmooth-Cast™ 305 Liquid Plastic Resin for Special Effects, & More, White - Pint Unit

Very easy to work with great results, don't let it get old

I make small parts for custom action figures. This resin is the one I prefer. It takes about an hour to fully cure. The castings are sturdy.

It works quite well if you use both a vacuum to de-gas and pressure-pot to pressurize. I still have a few bubbles float to the top or get stuck on mold features, but otherwise this is the best option I have found available on amazon.The working time is short, I only have about 3 minutes (of the 7 minutes) to get it mixed and in the mold, but not as short as the 300 version, where I only feel like I have one minute (of the 3 minutes).I did eventually switch from this to the Task 9 version to mix it with color.

I’ve used a lot of casting resins and urethanes and this is one of the best Smooth-On has to offer. I like it better than 300 (2 min pot life and 10 minute cure), as 305 has a manageable pot life of 8 minutes and a cure time of 30. These characteristics make it an ideal material if you need to produce several casts in a day, while providing adequate time to mix and pour into your molds. The plastic is bright white as advertised when cured and durable.I’m producing very small castings (4-6 grams of material at a time) and the 1-1 volume ratio is very easy to mix and follow.

Probably user error, but this just did not work out for me. I gave up.

Set time is faster than suggested if you are using the entire trial unit or higher volume so be careful. Also watch your temperatures as warmer will also make it set faster. You don't need this product to set before you can pour it. It worked great for me - though it did leave a lot of small bubbles if you don't vacuum the resin first or pressure pot it once poured. The tiny bubbles may not show until you sand it. Love the product though, great company who is very helpful. Resin is very white and NOT brittle. Been using Smooth-On products a long time. A little trial and error is to be expected at first with any product but they have wonderful customer service. Lots of free 'How To' videos on their website, too.

Used to repair damaged refrigerator front, worked great.

My go-to resin for casting. Would not trust any other brand but Smooth-on.The 7 minute pot life is perfect for mixing in pigment and pouring slowly. If temperatures are colder or you are mixing a small amount, it will take longer to cure than 30 minutes.I would definitely recommend pressure casting with this as even in low humidity, bubbles can form and get trapped in more complex molds.If you plan to use it without a pressure chamber, the humidity needs to be below 50%, as with any higher, it will foam.