I've been filling gouges in a door with builders bog recently and it occurred to me that this might be good stuff to repair nicks and scrapes on my fins. Builders bog is a heavily filled polyester resin that sands really easily, and is quite a bit softer than fin resins. Does anyone foresee any dramas in using bog for this purpose, apart from the fact that my fins might look a bit pretty with pink patches here and there. Obviously I'd have to be careful sanding, and if the bog falls off, then I'm in no worse position than before I started.

When i was ailing catamarans, we use to use the resin. But now that i have to face the prospect of fixing my own fins damn wello westerlies on low tide, i am thinking of using something easier. The bog sounds easier as you won't have to muck around with shaping tape as it is much thicker to work with.

There will be no difference in the result as next time you hit it they both fall off no matter which way you do it.

Polyster doesn't stick quite as well as epoxy but it should work fine, with one note of caution. Epoxy and polyeater don't work well together if on of them isn't completly cured. Not sure which way round it is now, but the fumes given off by one them even several days after it's "gone off" will stop the other from setting at all. So if you decide that you don't like the polyester and want to use epoxy, either sand all the polyester off or wait several weeks for the polyeater to fully cure