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CRL Sika® Urethane Primer is formulated for encapsulated parts that now require the new primers for OEM bonding strength when urethane is being bonded to the encapsulation rather than to the glass. PVC and EPDM encapsulated parts can not be bonded to the body using normal primers. S1KA21530 can be used with these S1KA Urethanes: S1KA220, S1KA280, S1KA255 and 268523.