Leading was done for decades prior to the invention of "Bondo" plastic body filler. As long as it's done properly, there's nothing wrong with using plastic. Plastic isn't "superior" or "inferior" to lead but is a lot easier for the do-it-yourself types to use.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| 
