Many threads on this subject. I havent read anything like this used to seal the hull of a aluminum boat mentioned.Please excuse my typing ability as it is poor but i will try to convey my message the best i can.I recently bought a 1966 richline riveted aluminum fishing boat.On the first trip out i found out it had a leak or maybe several.I did some research on several products such as gluvit and decided to try something on my own.I bought some marine goop made by eclectic products.I researched that the solvents for this were touline and xylene.Colman lantern and stove fuel are made of xylene.I put some fuel in a smsll mason jar added some goop put the lid on and shook it until it became a syrup consistantcy.You have to shake it with a lid on instead of stirring it because the solvent will evaporate quickly and it will thicken up.Before doing this prep the boat i used eagle one mag wheel cleaner.That mag wheel cleaner cleaned better than the acid wash i bought at the marina.Down to bare metal.Just dont breath the fumes it will gag you.Rinse the boat off with a hose and wait for it to dry well.Best to do on a hot sunny day.Tip the boat upside down and lift up the side you want to seal first with the seam facing up so when you brush on the sealer gravity will draw it into the seam.Brush on mixture liberaly.Apply two coats.Tip the boat up the other way kind of like a side to side thing and seal the other seams.I have done this and not a drop has come into the boat for about 20 dollars.Ill see how long it lasts. I also painted over rivets. This sealer is clear and isnt very noticeable once the boat gets dirty again.