Just about getting to the point of covering my Smoothie XL and, having never touched Solartex before, was wondering about prepping the surface.

Monokote (or Ultracote, et. al.) really shows the wood grain of the substrate and hence one needs to fill and sand it pretty thoroughly. I would usually go all the way to 600 grit and obsessively fill little tiny imperfections before application. As Solartex is is a fabric, how far do you guys go? Does it, as I suspect, hide minor surface flaws enough that I can skip all the obsessive-compulsive surface prep? SO fa I have my plane sanded smooth down to 320 grit and I'd like to stop there.