Can this be over sprayed with a clear lacquer to protect from discolouration or would the lacquer just peel off in time?

My answer to your question is no. Because of the way sikaflex works is that it doesn't dry totally so it remains flexible to take up movement. This leaves the seal intact and waterproof. Paint or lacquer will crack a fall off in my experience

can it be smoothed with soap water?

I've just used it to seal my lockers on our caravan. Used a mastic gun. I would not personally use soap to smooth it over. Once on its better than no more nails. But like I say I used it for our caravan.. Excellent stuff

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🔧 Seal the deal with pro-grade durability and style!

ECO SMART FORMULA - Solvent, silicone, and PVC-free for a cleaner, safer workspace and environment.
VERSATILE ADHESION - Bonds effortlessly to wood, metals, ceramics, plastics, and painted surfaces—one sealant to rule them all.
PROFESSIONAL FINISH - Paintable and sandable for seamless integration into any project.
ULTIMATE WEATHERPROOFING - Stay worry-free with superior UV and aging resistance for long-lasting seals.
ELASTIC ELECTRICALLY RESISTANT - Flexible yet tough, perfect for dynamic joints and electrical insulation needs.

SikaFlex 521 UV is a 300 ml polyurethane hybrid sealant designed for multi-purpose use. It offers exceptional weatherproofing and UV resistance, bonds to a wide range of materials including wood, metals, ceramics, and plastics, and features a solvent-, silicone-, and PVC-free formula. Paintable and sandable, it delivers a professional finish with elastic and high electrical resistance, making it the go-to choice for experienced professionals seeking durable, versatile sealing solutions.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

171.95 DT

Duties & taxes incl.

Tunisiastore

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TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Manufacturer	Sika
Brand	Sika
Model	Sikaflex-521 UV (Alt)
Product Dimensions	4.9 x 4.9 x 22.5 cm; 420 g
Item model number	54864
Manufacturer part number	54864
Special Features	BIANCO
Item Weight	420 g

SikaFlex 521 UV, White, Polyurethane Hybrid Multi-Purpose Sealant, Adhesive Sealant for Sealing and Elastic Joints, Weatherproof, 300 ml

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