Q: STUCK ON YOU
Dear Doc, I am confused about when to use an adhesive sealant, such as Sikaflex 291, or a plain sealant, like silicone or polysulfide. Can you offer some guidance? Doug Zachary Accomac, Virginia
A: It would be easier to answer your question if you supplied me with a specific application. That said, an adhesive sealant would generally be used in cases where regular removal of the fitting or fixture was not required. A plain sealant would be preferable where the fitting being sealed was expected to be removed at some point. The screwdown hatch that conceals a fuel tank might best be bedded in sealant, for example, while the intake through-hull for an air-conditioner or livewell might be caulked in place with an adhesive sealant.