Late entry as I don't visit very often.
I had a Vinyl Flat and it sort of worked about half the time so I tried a friend's AFI.
We successfully flattened many records but also destroyed a couple of records.
Notably an Audio Fidelity Blade Runner, numbered, red vinyl.
We had done several colored records with success but this record was rendered unplayable by the AFI
The record was flattened but the surface was left with an orange peel texture.
Don't know what vinyl mix QRP used but it didn't respond well to heat treatment !
Next victim was a mint original pressing Fleetwood Mac Rumours,
Again flattened well and orange peeled.
Not as bad as the Blade Runner, it was playable but with lots of noise.
That was the end of my AGI adventures.
Warped records are now endured or if they are really bad, get replaced.