Sika
Sikaflex 521 UV White STP Adhesive Sealant, 300 ml
amazon.co.uk price: £17.39 (as of 03/10/2026 12:12 UTC) Details
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White STP sealant for elastic joints
A white, weather-resistant STP adhesive sealant for experienced professional users.
Sikaflex 521 UV is supplied in a 300 ml cartridge for elastic sealing and bonding. Its silane terminated polymer (STP) formulation cures through contact with moisture and is suitable for internal and external sealing applications.
Professional use and material checks
This product is intended for experienced professional users only. Test adhesion and material compatibility using the actual surfaces and working conditions. For materials prone to stress cracking, seek the manufacturer’s advice and test the original substrates before use.
Finishing the joint
The cured sealant can be sanded and overpainted. Check the chosen coating and follow Sika’s application guidance.
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