Just got my oak wood kit in. What is the best sealer to use on it? Also, have new angle strips...the old ones are welded in place, no problem there, but once they are cut out, do they hold up the bed sides? It looks like the bedsides are mounted from front and rear of the bed. I just don't want to cut out the angle strips to have the sides sag until i get the new ones bolted in. Truck is a 63 chevy sb/ss.