I've had this problem before but never got a good answer for it. I am refinishing a table. I've sanded it down, cleaned it off, applied 4 layers of Minwax stain over the past week. Let the last coat sit for about 7 hours then applied a layer of polyurethane. After the first coat of polyurethane, when it started to dry, I noticed white streaks on certain areas of the wood. It almost looks like someone took a piece of white sandpaper and tried to scratch it. It looks like its under the polyurethane but it wasn't there to begin with. All the materials are oil-based. It is humid here and I am, unfortunetely, having to do this project outside in the garage. PLEASE help.

I'm just starting research on painting my south-facing aluminum garage door. Have already hosed it down, and I think there is latex paint on it now (chalky fingertips) Any recommendations on a paint brand? Primer? What to avoid? Tight budget, but I want it to last. Think Michigan winters...