Can you paint over Ospho if it's still damp?

Re power-washed garage door (Katie):
It sounds like the power-washing pressure, temperature and chemicals loosened the bond between epoxy and glass fibers.
Buy a large container of fiber-glass resin, with activator / hardener.
Brush this on, mixing small amounts as you progress (sets quickly). When completely cured, lightly sandpaper and re-coat if necessary to remove furriness.
Paint with undercoat and weatherproof surface enamel paint.
Acetone solvent can clean (messy, sticky, smelly) resin.
Edit: Wear protective clothing - those fibers itch!! :)

I assume you want to paint it. Preparation is the key. Rustoleum has some pretty good products that look close to stainless steal. Clean the outside thoroughly. The paint will only stick well to metal surfaces. Plastics will tend to crack and peel. Tape and paper off all the parts of microwave not being painted. You will not want to get paint on labels, keypad, plastics or the door seal. Paint takes and hour to dry between coats. Practice with long strokes on something else first. Several thin coats is better than one thick one. Fumes can be strong. Outdoors without wind or a garage will be the best area to paint. Paint is oil based and you will need paint thinner( or WD-40 in a pinch ) for cleanup. I don't think painting would be wise inside the microwave. I painted my range hood, and I swear it looks like its stainless steel. I used the brushed nickel color. Good luck.

did you ever try to mix water with oil? what was the result? are you sure that you can cross the street without adult holding your hand?

unfortunately you need to remove all that paint, just drop few shovels of fine sand over, and scrape it... sand will adhere to the tp surface of the pain and will allow you to scrape it. after you scrape it off, use any degreaser or similar product to wash reminder off, leave it for few weeks to dry through and then in small patch try if it would accept latex pain, roll it very, very thinly and leave overnight, if it is dry (solid dry) after 24hrs and do not peel off, you can then use this paint on the rest of your garage floor.

now, i would advice strongly against painting garage floor with any paint except concrete paint (they are usually water based with strongly alcalic ph), and after that use concrete seal. this should give you long lasting surface, sealed from oils, dust, water and whatever contaminant you can imagine in the garage.

You should first put a layer of primer using wood primerfrom a spray can. This will prevent thepaint from being absorbed into the wood. After 24 hours, you should use acrylic black (or whichever color youwant) paint in a spray can. The reason Irecommend spray paint is because it's easy and gives you tan even, blemish freecolor. Wait 24 hours (so that bubbleswon't form) and do another layer. If itdoesn't look thick enough to you, wait another 24 hours and do a final layer. There is no need for a clear finish.

Good thing it is still working! But it is beer so it is sticky. If you have the tools for opening it, open it up and wipe off the insides using a damp cloth, especially on the keypad part.

Try rust restore solution if you are wanting to do this your self Sherwin Williams sells a product called Ospho wipe or spray on and ready to paint
Converts rust to a Matte black won't discolor your paint