i bought this jon boat and i coverd all rivit heads and patches that the other guy did with a hard epoxy plus there are a few small leaks, now a friend was say on an aluminum boat (maybe .030 thick) the epoxy will crack due to the fexing of the aluminum , he also said to use aquerium silicon and cover those same areas basiclly if you can use it in a fish tank why not a boat.     what do you think?

It would probubly work. But I'd see how the epoxy did first

that or a gallon or so of roll on bed liner would work.

no,no,no....put boat on a set of saw horses, fill with 6" of water.  Look underneath and circle all leaking rivets with a crayon.  Drill out old rivet and replace with a tapered head bolt and nut.  A dab of 3m 5200 on each bolt.

Like granpappy said, when it comes to problems, eliminate, don't compensate.

Your very best bet is to have them welded but not everyone knows someone who can weld aluminum.

drilling out might be the way to go but but the boats seen it's better days, i did fill up the boat and found droplets and did circle them , now i want to just clean off the surface and cover those areas with that type of silicone.

3m 5200 is far more perminent then aquarium silicon.  It will take several days to fully cure, but will not come off once cured.

TD