My 63 Corvette's block had been partially decked.
3 of the original numbers are still visible. (off to one side)
A good friend of mine is a detective with the local police auto theft division.
He worked on my pad for few hours. We finally had to stop,
The existing numbers were starting to suffer.
That stuff only works when you don't care what you end up with.
In other words, it can turn the whole pad into shadows.
The acid removes the metal, untill the shadow of the numbers are all that is visible.
It works great when someone has tried to scratch out the numbers.
Not so good when the top of the pad has been decked away.
I decided to just keep what little bit I had.
Not going to restamp, NEVER - just going to leave it the way it is.
Once it is stamped - it will alway be a restamp.
NCRS knows when those numbers are restamped. (because of the huge database)
They deduct points same as if it is a repro part. With NO numbers - you would get a bigger deduction.
When I sell the car, I can honestly say that "those are the original numbers" - just some are missing.
Better than having a restamped block, in my opinion anyways