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3. Son of a Gun! vinyl protectant maker

Alternative clues for the word stp

• Race car sponsor
• Oil treatment letters
• Mescaline rel
• 'The Racer's Edge'
• Racetrack letters
• Part of the Armored AutoGroup
• Initials on a Nascar car
• Popular engine additive
• 1985 Union Carbide acquisition
• Fuel additive that's a longtime NASCAR sponsor