Yes, but it won't work as well as exterior paint. The difference may not be visible in the short run though. But interior paint formulations do not include such additive as moldicide/fungicide that help paint resist wet exterior conditions, or stronger elastomerics that help paint better expand and contract with the outside temperature fluctuations, or sun protectors and special pigments that resist fading. Outside paint also create stronger/more durable surface film for better surface protection.
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Oil paint?
The difference between them is weatherability - interior is going to deteriorate far faster than exterior if used outdoors, that is all.
Don't worry about it, it'll be fine. You just spent more money than you needed to.
No, most interior paints do not have enough freeze-thaw flexibility nor UV resistance to be used successfully outside. If you seal it with an exterior paint, that will take care of the UV issue, however you would want to seal it with a 100% acrylic primer, then coat it with a high grade paint to overcome the freeze-thaw problem. Neither interior nor exterior paints are weatherproof, only weather resistant.
No, interior latex paint cannot tolerate the outdoor weather, and it will wind up flaking and peeling off your gate posts. Only use an outdoor enamel paint for outdoor painting.
Many hotels that use paint use satin or semi-gloss latex paint in their interior applications.
one is for outside (outdoors, water resistant) and one for inside (indoors, not so water resistant)
Sherwin williams paint catalyst for mixing with certain paints to be used outdoors in the elements. V66v27 is used for inside paints.