I accidentally spray painted some gates for my deck with interior oil-based paint. They had been previously painted and I was touching them up after about 7 years use. I put 2 coats of the oil-based interior paint on them. They are white. I'm wondering what I should do. Would it make any difference to put a coat of exterior paint on top? Should I just put them outside and wait for them to wear out again?
One big difference between interior and exterior paint is the flexibility. Interior paint does not have to deal with as drastic of temperature changes. Odds are after a summer the oil based paint (even if you put a coat over the top) will get very brittle and begin to crack, particularly if the paint did no go onto bare wood.