My daughter just bought her first condo. The kitchen cabinets were gone over with a light white wash at some point. It feels like there is little if any "finish" coat. The wood is a little bit raw feeling to the touch. She wants to put a clear coat on them. Is it safe to put a water base clear coat? I know it won't stay if the under coat was oil base but I thought since it felt rough it may adhere well anyway. Is there a way to discern if existing stuff was oil or do I not even need to worry about it?