Q:The product data sheet for the Tite-Loc Plus system appears to have sealant in the hemmed section. Is sealant required at this location for a 20 year watertightness warranty? Can sealant in this location be: 1) factory installed 2) if not factory installed, what are the approved sealants the warranty requires for PAC approval? A: Thank you for the question about sealant in our Tite-Loc panels. The sealant is factory applied and comes standard with the panels. This item is not an option and is required for our weathertightness warranties