They do not use a sealer for welding, as it would melt and burn, and contaminate the weld, they may have applied some sealer after it was welded, but not before. Its amazing what will work with aluminum, I do all mine by welding since I can and do weld aluminum but that's not always possible or needed with some problems. I have seen some fishing boats that are pop riveted with beer cans and roofing tin over big holes, makes you shake your head and laugh, but I also have to admit they hold up and don't leak! Now I would not have done that but many people have with success. A good pop rivet in the right size is way better than a poorly done blind rivet. In the day we live now you don't have to make patches with blind rivets, they are better only if they are done perfectly. The strength of these rivets are all rated so you can get what ever you feel is needed, but for a patch that's stronger than the surrounding it dose not have to be that heavy, look up the numbers. With these rivets you do want to use some good marine caulk and make sure the pieces are tight before you squeeze the rivet. Some of these rivets have a steel anvil so they are strong enough to pull the rivet, that's not a big deal as that is inside the rivet and is not against the boat or any other rivet and would take about 15 to 20 years to cause meaningful problems, and then you can replace it in about 70 seconds if and when it dose. You can buy heavy rivets, that are closed water tight rivets that you put in using the big rivet gun, It looks like a big pair of bolt cutters. These can be easily fixed, if you don't try to do it cheap.
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