We've installed a Heat and Glo "cutting edge surround" on one of their gas stoves. The surround is made of "crystalline silica" or some sort of a quartz product. They say "oil based stains can be applied just as they would be on a wood product" which is what we've done. It looks great, but now we've wondering how to seal it.

I want something that will be durable and long lasting, but will also stand up to the heat. A matte or satin polyurethane would give us the look we want, but how will these hold up to heat? Is there a "clear-coat" product out there designed for this kind of use?