Whatever it takes bud! It sure does look like it worked to perfection! Looks like new...
Nice work, I don't envy the blasting one bit but it sure makes it all look allot better.
It wouldn't hurt to try what chargin is saying, you never know and if the metal is not rusted up all the way to a mess, it could work, its hard to tell without actually seeing it. Maybe if you post a couple pictures someone here may have the answer that is the best for you and the car, You've done a great job with your work and i do hope im not throwing a stumbling stone in!
It's better to bight the bullet then leave something that you won't be happy with in the end. Hopefully your getting close to welding instead of drilling, good luck.
Sure as heck wouldn't want that puppy rotting from the inside out after all that hard work! Roll on!
You are showing quality for sure, everything like this stuff i do im using that Eastwoods rust enpsulator and now POR-15, I already bought a gallon, which im not wasting.. Thought id mention what i use in case it may help, If these cars rust out in another 30-40 years, Well, i guess someone else can have the fun huh! rofl... Your work truly does look great!!