Grille repair what should I use?

I am just a novice, but I recently bought "Platifix" online. I do not have any missing tabs/fins on my 73 Duster grille, but it has worked great on cracks. The package comes with a small bar that can be molded to make missing tabs etc. I since went back online on bought 3 more bars seperately just in case. If you do buy the kit, buy extra applicator needles. If they plug up, your screwed which mine did.

I have several grilles with cracks so I hope to get better at the repairs.