I'm going to redo my aluminum boat over the winter-new front deck, etc, and there will be a lot of holes to fill from how the previous owner did things. I saw that someone (CRAY?) had posted a link to the dura-fix system. Having had extensive brazing experience in the past I thought I would give it a try. OMG, it is amazing. You have to have some nerve to try this, and I practiced on a thick (3/8") piece that had many holes in it. It takes some getting used to - like all new types of welding do - but once you get the hang of it it is neat. I have't tried any applications other than horizontal, but if it works out I may weld rather than rivet all the bracing/supports for my new deck. I did try to lap weld a very thin piece of aluminum flashing. Once I adjusted to how quickly it heated and cooled I got it, too. Neat thing is it can be used on other non-ferrous metals, too. Strange thing is the lack of fluxing. Just thought I'd post this in case anyone is looking for an inexpensive way to make their own repairs.