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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?

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Any interior paint I have seen used outside has fell off –  Jack May 29 at 23:59
    
well, i'm going to give it a coat of exterior semi-gloss and see how it does. i'll report back every year or so. :) –  Martin Serrano Jun 1 at 20:09

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I have used oil based indoor paints many times outdoors. Mainly on sheds. The only issue I have had with it is an extreme amount of discoloration. Bright blue turned to really dull pool liner blue, off white turned to dirty-light-yellow.

Honestly I would leave it be for now. If you painted over other latex it might just fall off once it fully hardens and hits a few temp changes. That will make scraping it easier. If it doesn't fall off then just see what happens. It isn't hurting anything.

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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.

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Most exterior rated paints incorporate UV inhibitors to protect against the sun's harsh rays, while interior rated paints do not. So I'd expect discoloration and premature deterioration.

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