I have a simple and probably stupid question to most of you, but being a newer boat owner and never done much work on one, a problem for me. Is there a way to easily and without a ton of cost waterproof the 2 floor hatches in my 73 model 22-2? Every time I wash the boat down I have to get a towel and dry out my hatches. I tried some foam rubber stuff from the hardware store but it did not stay well. What should I do?