problem solved
I took the advice of several of the responses.
1. I used marine lubricant on all of the snaps (looks like vaseline but more expensive) and it sure does make it a lot easier to snap and unsnap my canvas these days. I used a Q-tip to apply it. Worked great.
2. I purchased the marine tex putty stick. I put some in the holes and then as it just began to harden, I screwed the screws back in. I had about twenty of them that were loose and about 5 that I could just pull out. They are all tight and hopefully will last a long time.
Thanks to everyone for your suggestions.
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