May 10, 20170 found this helpful
There would definitely be a difference in thickness of the keys, as nail polish goes on pretty thick and nail polish would eventually peel, then you'd really have a mess to deal with. You really need something to be absorbed into the wood.
January 18, 20170 found this helpful
Consider getting plywood cut to the size of your box spring and place it UNDER the box spring, and supported by the frame or rails. The plywood will act as a barrier and protect your dogs head from sticking it up there where his mischievous self does not belong.