Hi,

Are you sure the flex would be able to heat well enough through plywood?

I would be tempted to plan on putting it inside and silicon sealing a piece of vinyl flooring or something over the top of it to keep it away from liquid doins.

As to the sealing I don't know enough about the melamine paint to comment but, as long as you let it cure well, I think polyurathane would be ok.


dr del