Hp273 Valve covers back from Leanna

How did the finned pieces come off without tearing out the baffles???
I stripped mine with a wire brush, hosed them with VHT wrinkle (which matched my Hemi valve covers the closest) and ran them through a commercial dryer to wrinkle them...but not TOO wrinkle-y. Ran the tops of the fins under a polishing wheel and jewlers rouge. Then dipped the wire looms with plasti-dip. The rubbery stuff you use to coat tool handles. came out like factory new.