i need to underseal my camper
Can you tell me why you think you "need" to add an undercoating to your camper van? (Unless you live in Ontario, you probably don't need to).
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After high pressure washing underneath your camper, you can apply roofing coating with a brush. You may have to dilute the tar with a solvent to make it thinner.
I would not apply it in areas around the exhaust. Roof coating will catch fire if it gets to hot.
And your question about this is?Clean it down and buy a commercial underseal either spray or paint on.