I did one of each. Our original galley flooring was in good shape so I sanded it and glued the Plasteak directly over the original. Four years later it still looks and adheres fine. The head flooring was not as good so I removed it and rolled on 2 coats of West System epoxy before glueing the Plasteak down. The secret to removing the flooring and its glue is 3M adhesive remover. That stuff has mutiple uses. It disolves glue like acetone or MEK but doesn't evaporate as quickly. The fumes are not a health problem according to our companies medical dept. It does smell pretty bad though. If you ever have something that was duct taped and you tried to remove that gluey crap, this 3M product is the only answer. The old flooring glue won't jump off, but with enough soaking and scraping, it will come completly clean. I am not sure of the 3M number for this product, but it comes in a red quart can with a pouring spout. I think it is 5300. I poured my gallon of it from our 55 gallon barrell, so I don't have the exact desciption of the can. You always want to keep a quart can of this stuff in your arsenal of solvents.