Sharktooth grille repair

Nice work.
I'll be showing pics of my plastic welding soon . Getting pretty good at it.
A couple things I should mention that may help... the plastic is actually ABS.
Most cements will bond all the types so its not biggie but, ABS spacific adhesive is black colored, more flamable and bonds ABS stronger.
Where possible and practicle, masking can be done with poster paper cut exactly to size . They can be reused, wherever deminsions repeat. Like just folded over those fins where are blacked first. If you predict the silver to bleed under those masks you're right. A close look at the factory paint job reveals the same. Your tape out results will be better than original. LOL
One more thing... that single edge razor blade shown in a pic, Is that all you're working with ? Harbor Freight Tools and others have a nice kit of exacto or hobby knives at 5 bucks or less. Worth their weight in gold to me.
Happy moparing :)