Opinions please. Need to fill pits and pin-holes that formed under the vinyl top. I am NOT replacing the vinyl top. When all the welding and patching and prepwork is done, what filler would YOU use?

In all reality you shouldn't fill holes with filler. The areas with holes should be replaced. Anytime filler is used all corrosion must be removed before it's application. IMO the absolute best durabilitywise for strength, adhesion and moisture resisitance is Evercoat's Everglass filler. Filling pits with filler is no problem, but filling holes isn't a good idea, usually when a hole is filled the filler is left open unprotected on the backside of the panel to absorb moisture and then fail. If it's a beater fill the holes, if you plan on keeping the car for a long period of time and want it to hold up then replace the areas with holes. JMO

I was already leaning towards the Everglass due to the many previous mentions here. We're going to weld and patch as much as possible but I'm sure a couple of tiny pinholes will survive our best efforts. The plan is to replace the quarters in the future so this work is just a band-aid until then.

The everglass products are good products and should be used as directed. As already mentioned, regular filler's "Will Fail" because of the poly content. Polyester will hold moisture whereas epoxies will not. If your headliner, sail panels etc... are out of the car, you might consider treating the inside of the roof panel to reduce active rust.

The simple rule is weld what you can (watch your interior especially if the headliner etc are still in the car. Next, thin coat with f-glass filler or something like Metalux or other metal impregnated epoxy filler, then finish topcoat with regular filler and evercoat glaze putty. Might sound like a lot of effort but remember that it's what's underneath that shows everything.

Hope it Helps.