Pin hole repairs

[sickshaun]

Hello new here.. Purchased a early model sears and previous owner had screewed wood to back of transome with a hundred screws. Been filling holes for days with welder. Looks really good just when i shine a light behind it theres lots of small pin holes. Do I keep hitting with welder or is there a type of bondo for aluminum that I can spread on there and smoot out prior to painting to seal up all the little imperfections.

 

[sonny1]

I would use a fairing compound. Total Boat sells some good stuff. Those pin holes are called porosity and yes it will more than likely leak. You will have to prime and paint after applying the fairing compound.

 

[kazzer]

Hello new here.. Purchased a early model sears and previous owner had screewed wood to back of transome with a hundred screws. Been filling holes for days with welder. Looks really good just when i shine a light behind it theres lots of small pin holes. Do I keep hitting with welder or is there a type of bondo for aluminum that I can spread on there and smoot out prior to painting to seal up all the little imperfections.

Try this! Gas Tank Sealer. If you can get to the underside, cover it with blue masking tape to stop the resin from running through, then simply brush on a couple of coats, leaving a couple of hours between them. This is some really tough stuff and particularly resistant to fuel. Sorry for the company plug.

https://mud-skipper.com/gas-tank-sealer.html

 

[seahorse]

I always used JB weld for small holes, sand the metal clean, then use the JB weld like body filler and sand smooth. You can then go over it all with what ever you want if you want it perfect.. I had one boat years ago that had a good bit of perforation all over the the transom, but not enough to do any structural damage, just deep pits and small pinholes. I acid cleaned the metal, sanded it to remove the oxide layer and then filled the pits and holes with JB Weld, then after getting that as smooth as possible I followed it up with zinc chromate primer, then a half dozen coats and sandings with filler primer, sealer, and the final three coats of color. Right or wrong, it worked and I used that boat for 12 years afterwards before selling it for something bigger or wider.