I experimented with this product and was quite surprised at the results. I do not know what material it is but thought it would not accept blending with a water based paint. I added a couple drops of Polly S to it immediately after mixing and the materials blended well. I had expected to see them curdle or something. Then I waited to see if it would harden correctly, and it did. I also did a test pour on blue insulation foam to see if it would attack it, it doesn't. Just thought I'd pass the info along.