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Basically, most sealers can be thought of as paints...the are mere coatings, however, oil based sealers are penetrants. Because many birds are avid chewers, I would pass on trying to seal the platform & frame.
speaking of the frame, if you were thinking of putting the frame on the bottom of the platform, you might have a balance problem because you would be raising the center a gravity, increasing the tip factor.....
Just be sure you don't use any treated wood in your project.....
Of the couple that I have seen, one had a surface of sheet vinyl glued to a plywood base and had vinyl edging to close the edges.....however it did not look like it was designed to have water sprayed on it regularly (I really don't think the edges were sealed to any degree). The other was painted with lacquer, still a paint, but one that is sprayed on.
I did see some for sale at a bird show, a couple of years ago. The base was laminated with (in the U.S) shower board. The edging was made from oak 1"x2" and cut to lip over the top edge to self mould the top deck. All hardware was stainless steel.....
You may need to find one you can go look at.....
None of the ones I have seen looked like they were designed to be cleaned off with a water hose, rather a damp clothe would probably be OK.....