Originally Posted by Silvertriton
For sure it is easier to do a resin patch up on a remote beach but aluminum welding is pretty common even in the poorest of areas due to the popularity of repairing refrigerators and a/c instead of replacement
Its quite difficult to reweld aluminum which has spent much time in saltwater. The salts penetrate the metal and contaminate the welds. You end up having to weld it, grind out the contaminated weld, reweld, regrind, reweld. Basically burning away the salts. You will have a hard time finding a <good> marine quality welder, I have had good and bad work done on my hull. The quality differences are striking.
Which sounds not <that> bad, except that the hull is heating up like mad... And you run the risk of the hull or the sparks burning a hole in your tubes.
Repairing GRP is actually easier, at least in small amounts.