Yes. Silicone based. Father in law used Thompson Ultra one coat, still did 2 coats and I was.

Can you skim over silicone?

If the compound is truly 100 percent silicone, you cannot spackle or paint over it. Test the compound by applying a latex paint to the surface. ... Because your skim-coated lath-and-plaster walls have been damaged, you'll want to carefully prepare them for painting.

Does masonry paint stick to silicone?

Therefore, while you technically can use standard masonry paint on top of Silicone Render, we recommend that you use Silicone Paint because it is also highly breathable.