I spoke to a rep at Kelley and he said if I removed the old plaster, (and properly prepped the gunite) the primer would fill in the roughness of the gunite (as well as small cracks) and give a smooth surface to put the final coat on. Does that sound ok?

He also said his product would adhere to the fiberglass walls. (with prep & primer) He couldn't suggest what to use to repair the blisters, only saying it must be compatible with their primer. I am assuming an epoxy mixture over the grounded out blisters would work? Is there a difference in applying the primer to the gelcoat vs the epoxy repairs?

He said they have a product used as a caulking to fill in the seams. Does the primer and top coat stick to this well?