If your roof is TPM you are better off using the Alpha Systems line of sealers. Dicor can cause some swelling if used on a TPM roof material.
It is typically a good idea to remove as much of the old sealer as possible and then apply the new to get the best repair. If it is a small spot repair, a good dab of self level over the suspected site should do it.
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2017 Dutchman Denali 287RE
2017 Nissan Titan XD diesel
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