Woodworking

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?