I just finished a really big project using these stains. I've always been a fan of acid stains, but surprisingly I got better results with StainFast with a lot less trouble, and I also loved that it didn't cause a headache or require me to wear a respirator. You can see what you're getting as you apply it so it is quite easy to use.
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I just did a bunch of eps carved flowers that I coated with "foam coat" from the "Hot wire Foam Factory"
I think this material is similar to the hydro-cal material. I'm not sure exactly what their recipe is. They have a fortifier additive as well as another additive that created a more flexible surface.
I found it worked quite well. I used latex paint as the liquid ingredient. The nice thing about this is that you can create a recipe that is a little stiffer or thinner as needed.
The product adhered quite well to the eps foam, and stuck well to the board we where finishing on.
The latex paint gave us a longer working time, which seemed to be around the 45 to 60 min time depending upon the mixture.
It does say that you can sand this product, but found it to be difficult to sand by hand. We did not require the finish to be sanded, so I didn't spend allot of time trying to smooth the finish in this way. They did mentions a tapping technique that worked well at leveling the product.
Correspondence with the company was very prompt and helpful. I was doing the coating on a Saturday and Sunday, and they returned my e-mails even on the weekend. Instructions for mixing and application where very straight forward, and the website offered good tips for use.
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