While at the Lima 1/2 mile I talked with a fellow who was selling fiberglass cycle tanks. The discussion lead to sealing old fiber glass tanks. He had a product that he was selling made by Caswell Plating. He has used it on old glass tanks with success. //WWW.CASWELL PLATING.COM I have in the pass suggested Contacting WEST SYSTEM in MI and asking them for a solution to blistering, etc.. Perhaps this may be of help to some of you. Amherst Paul
Paul,
The product you are referring to is Caswell Dragons Blood Sealer. I have used in many Penton, Bultaco and Montesa tanks. Have not had any issues with it. Great product in my book.
Thanks,
Kevin