I stripped a galv. steel door down to the bare metal, washed with mineral spirits, primed with 2 coats Rustoleum High Performance Metal Primer(oil based) then painted with Glidden Fortis 450 semi-gloss. Since drying the paint has faint “blooming” spots that are seen in certain light. It looks like oil

What will happen if interior paint is used outdoors and it has several coats of polyurethane on it?