I know this topic is a bit outdated but I felt I should comment as I sell specialty coatings for a living. Depending on what you use as support should affect your decision on the coating...I built a wood enclosure so I went with a stain and waterbourne polyurethane clear coat. Stain is a tung oil which resists water permeation, the water based poly clear further protects with a diamond hard finish and is non toxic. Metals should be coated on an oil base as it bonds better than latex and is longer lasting. If you must use a latex go with a semi gloss or higher sheen for durability and ease of cleaning. Glossier paints are less porous like epoxies. I dont advise using epoxies unless you have used them before, and it is a waste if you have to cook up a batch for a small area, as pot life is only one hour then it hardens up. A REAL paint store can help anyone get these products, not home depot their stuff is garbage. I even went a step further and stained the upper canopy of my cage green the sides bark brown for that forest effect.

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