Adhesive backed gaskets are installed with the adhesive facing inwards, to aid placement and installation of the gasket only. At no time should water be allowed to contact an adhesive backed gasket.
If water is allowed to contact an adhesive backed gasket, the adhesive will fail, causing the gasket to fall off and leak. Adhesive backed gaskets can also be installed with the adhesive facing outwards, to aid in placement and installation of the gasket. This is less common than an inward facing adhesive application, but it can be used for certain applications. The composition of an adhesive backed gasket is usually a rubber or polyurethane material and will have an adhesive backing to aid in placement and installation.
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