Oils, Fluids and Sealer› Sealers, Gasket Makers and Glues

Sika Corporation

SIKAFLEX521 UV GRAYWEATHERINGRESISTANT STP ADHESIVE SEALANT W/WIDE ADHESION RANGE300ML

$36.87

SKU: S0FF 563890

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item

Description

The Sika Corporation Sikaflex 521 is a light gray, UV-resistant, low-modulus sealant designed for multi-purpose use. This one-part silane-terminated polymer sealant cures upon exposure to atmospheric moisture, forming a durable elastomer.

It bonds well to a variety of substrates including wood, metals, plastics, and glass, without requiring special pre-treatment. The sealant is resistant to UV radiation, aging, and weathering, and is formulated to be solvent and isocyanate-free. It is also silicone and PVC-free, with low odor.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSika Corporation
Part NumberS0FF 563890

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy