I didn't think this could happen at room temperature but it can. I had a small paint can that was either 25 or 40 years old with a bulging lid. I took it on the terrace and opened the lid with my longest screwdriver and it popped up with a loud pop. I poured the solvent down an outdoor drain followed by two buckets of water and I threw the solidified paint in the trash. I checked my other paint cans and found a gallon can of commercial epoxy enamel (the larger part of a two part epoxy paint) that had a bulging lid. I took it outside where people in my building put large items that they're throwing away, then I went back upstairs to think about what to do. I found the following information from an internet document titled [I]Understanding Paint, what can go wrong?[/I] [INDENT]"Gassing in the can: This is usually associated with paints containing large amounts of zinc metal and aluminium flake pigments. The first sign of gassing is a bulging lid and immediate action is needed. If a can of paint has a bulging lid it should be covered with a denim type rag (these rags are useful for something). A 3-inch nail (75mm) should then be punched through the rag to make a hole in the lid and release the pressure. Tape the hole with masking tape and return to the place of purchase."[/INDENT] Sound good? I have goggles and I can probably find some old cloth but I'll have to choose between a new 2-1/2" nail and a bent 4" nail unless I make a trip to Home Depot for a 3 inch nail. I guess I'll try to straighten the 4" nail. I'm frightened. Hold me. [ATTACH]32640[/ATTACH] I wonder if hammering the nail in the lid could make paint shoot out of the edges of the lid. My original idea was to put a screwdriver through a piece of cardboard that could act as a shield and pry off the lid.

My 1915 home has a window directly over the tub. The window has since been replaced with glass block, but the wooden window sill is still there...and it gets a daily soaking from the shower. I've scraped the old blistering paint down to the bare wood, and need to repaint. Is it appropriate to use an exterior paint to help battle the harsh effects of the shower?