Sika Multiseal Plus Tape White Membrane Sika MultiSeal Plus a new self-adhering, multi-purpose roofing repair tape that, combines an advanced copolymer mastic that exhibits aggressive adhesion with a flexible, non-release, tear proof, UV resistant TPO membrane to create a fast, easy to apply, permanent watertight seal. Sika MultiSeal Plus bonds to a wide range of surfaces including challenging roof materials. The flexible non-release membrane allows the product to adhere to itself so that it can be stretched, cut and folded around intricately shaped roofing accessories to stop water penetration.