Whoa whoa whoa, let’s slow down a little bit here, it would appear that there’s some confusion over what the oven cleaner was used on.
The oven cleaner was actually used to remove the anodized clear coating from the trim pieces, not any chrome plating from plastic. I most definitely would not recommend attempting to use oven cleaner on chrome plated plastic.
Now that being said, I did paint some of the chrome pieces on the car with great success, most notably the insides of the headlight and taillight bezels. The prep for these areas is super simple; just thoroughly scuff the chrome areas with red ScotchBrite, mask and spray on your Bulldog adhesion promoter (same stuff I used), then shoot your black.
As simple as that. 3+ years on Olds Cool now, and no paint flaking from the painted chrome areas yet.