This is a very solid trunk lid, yes it had some rust under the rear lip. It was blasted and sealed several years ago. It had no rust on the outside and has no filler in it. It’s very straight. It’s original Pontiac sheetmetal. I’ve used this process several times with no problems, even after years of driving the car. The sealer makes it look worse in pictures than it is but it’s a straight, solid deck lid.
At 1/2 the price and for a better fit, I wouldn’t hesitate to use it over a $500 Chinese Repop… but that’s me.