I found I one little pin hole and decided that it needed to be patched. I bought "Kreem" which is a three step process for coating the internals. Did it yesterday and all in all it's pretty easy to do. First soak is with a mix of phosphoric acid to break up any rust and etch the insides. Then the next is MEK which is the kicker for the polyester urethane coating. The third step is to pour in the coating and move it around until all interior surfaces are covered. If you want to know more I can explain in depth.