Haven't heard of rustop, but sounds like Ziebart or Rusty Jones, which were popular years ago. I don't think it's neccessary any more - all car makers now galvanize and use a lot of plastic - for example, look in the wheel wells of your PT - Plastic - that was a favorite place for rust to start as stones got thrown up. Cars from the 80s on don't rust like cars of the 60s or earlier.
I don't think it can hurt, but the smell of the protection is a definite downside.
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'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
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