Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
My mobile racks for drying screens fresh from reclaim or post exposure washout are all pvc. I'll take a picture of them and post it in DIY sometimes this week. My storage racks for dirty screens or upcoming jobs (basically dry racks) are all metal rails with treated wood framed. In the actual drying room, I am using2x2's tacked to the corners so they can hold any size of screen. Since the only moisture on those screens will be in the emulsion, I figured wood was not an issue there.Thanks for the tip on the hydrometer. I'll grab one today.