There is some stuff called "bar-top epoxy" that can work well. Depending on the size of the cage, cost may be a factor.

Tile and grout works really well but is very heavy.

You can fiberglass the inside. Fiberglass cloth and polyester resin. I would go at least 6 inches up the sides.

Did you use water-based polyurethane? Or is it that MinWax sealer only. The polyurethane affords better protection, but it is not as good as epoxy would be. With polyurethane, you still need to seal the seams with silicon or other sealant.

If you use a substrate that is absorbent, you may be able to get away with the polyurethane.

I have an old wood cage (small cage) that I used Bondo to cover and round all of the inside seems. Then I repainted the cage using regular waterbased paint. The new paints they have now are very durable. They go on with almost no odor and dry quickly with absolutely no odor. Touchups later on are easy since it dries so fast. Cage has held up very well considering I did not use anything fancy.

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