So I park my snow blower in the garage and would like the snow residue to melt in place and not go all over.
I built this giant tray with a ramp so I can push the blower on it, that way the snow will stay on the tray.
I will caulk the seams and paint it with some resistant paint but I’ll like to either glue a tarp on it, or some other plastic material or perhaps use some special coating so it lasts a few years.
The “floor” of the tray is OSB (aspenite?). Not the best for this is what I had and this project is more of an experiment for me.
Any recommendations?

An oil based paint or polyurethane.
And this is enough? there won’t be much water (I do take off most before storing the snow blower) but it would be stagnant there until it evaporates, maybe 20 - 24 hours later?