My friend used it for his exterior trim and it's lasted as well. Being that it's exterior instead of interior, I can't say just how long it will last but he did state that prior to buying new exterior trim, it permanently got rid of any chalkiness. It is a dye so I imagine it would help permanently fix the issue. https://smile.amazon.com/dp/B006NZRAFE/?coliid=I3MIJLFUA9QN69&colid=2K63KOWT1QM8A&psc=0&ref_=lv_ov_lig_dp_it