Got an old 1975 12 foot Jon. Pretty beat up but def usable. I want to fix the many leaky rivets and was thinking JB weld might do? Any suggestions?

Try hammering them out first, that might do the trick. Use a Ball Peen hammer.

I'm with TopDog.  Try hammering them first.  Essentially you're tightening up a rivet that works a bit or very loose.  Make sure you have another hammer on the back side as you're doing it.

If you still have some that leak, don't use JB Weld.  It's not meant for marine applications.  Use Gluvit or similar product instead.  Do a search on the site for Gluvit and you'll find more info.  The last time I used it was a couple years ago and things are still watertight.  The stuff is bulletproof when applied correctly

Here ya go.  Check out my project I didn't tighten up the rivets but I used epoxy and it worked great.  Hope it helps

http://www.bassresource.com/bass_fishing_forums/YaBB.pl?num=1223478703/90

Thanks guys! I will def try to hammer the rivets before sealing. Ordered some Gluvit too. Plan on using some Herculiner on the inside for some added protection and going to give her a fresh coat of paint. Perhaps some seat and a troller to top it off. This is no doubt going to be a winter project as I have just bought a new house.

I tried putting on a bed liner coat but it didn't do much If I were you I would focus on stopping the leaks first then top if off.  It will save you some money

stay away from bed liners, after extensive use they will crack and peel, and the water will eventually cause it to bubble up and peel.

Fasco Unlimited is the place you want to look into.

Here's a link to the build on my 10ftr, not thee best boat on the pond, but it get its done!

http://www.tinboats.net/forum/viewtopic.php?f=13&t=4875

Borrow or buy a hand held air chisel.  Get the rivet attachment for it. Get the matching rivet head piece that you hold against the round rivet head.  Couple of hits with the air chisel will tighten them up.  

After you tighten them go with Steel Flex on the bottom.  Do a search on Tinboats for it.

It will be going on the hull of my boat next month.  Great Product.

It seems to me that everyone loves that d**n JB Weld. Find something else, the Weld just doesnt cut it anymore. (DISCLAIMER: My Opinion Only)

GOOD LUCKS TO YOU IN CATCHING THE "BIG KAHUNA."