Hello guys !!
I have made only 2 fiberglass drums, that's why I'm saying I'm not an expert (third time !!

), even if the second is successfull, I haven't the background of other guys of the forum. OLSONGO, if you have work on car repairs, I'm shure you well know the ability of the materials, better than anyboby.
When I see the damages on the drum, I think that's it will be a very dificult and maybe expensive repair, That's only what I feel !! maybe right, maybe wrong !
Salsero, The only thing I can say is : If you like this drum, just try to save it !!! and please, let us know the work with photos, descriptions, cost, and in any case, we will learn more about fiberglass.
Cheers,
Galou.