Don't get me wrong, the GTO is painted in PPG DBU. I am not advising using the Omni on the outside of the car. For the FB, I will use DBC on the outside, but I feel the Omni fits the bill for use on jambs, undertrunk, etc. where it will not see the harsh UV conditions from sunlight or have the potentials for scratches and weather. I have never used the Omni on the outside of a car so I can't say how it will hold up under those conditions.
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