So not a question about machining exactly, we've got that licked. Looking for something to spray, roll, flood, brush, whatever, on machined XPS that dries extremely fast, doesnt eat into the surface, is sand-able. It can take several coats, thats not a problem, but looking for something that will soak into the surface somewhat, flash off fast hopefully, and then be able to sand. When you have to sand/clean up XPS it can be a pain to have a corner of your paper catch and dig out a little spot or tend to roll up rather than sand. Im thinking there has got to be something that would soak in or sit on the surface and lock up the machined surface somewhat. Ive tried shellac and shellac based products (Bin), not great. Tried waterborne clears, possibly, but still working on it. Tried rattle can clears and enamel, not so great.
Any ideas? fast flash off would be great but that will likely mean solvents which more than likely wont play well with XPS.
Thanks.