is there supposed to be a Caulk Nozzles with this item.

Mine didn't have any, can buy packs of five nozzles from wickes or similar shops...

Whats the expiry date of this product

This is dependant on the batch purchased, details will be present on the tube

Which product is best for bonding in windows on steel narrow boat?

I send the black version for resealing fibreglass roof to windscreen area on motor home 9 months ago. Still holding well. I used the white version for sealing in a new skylight on motorhome. Once again, no issues so far. That was about a year ago.

Is this suitable to glue a solar panel to camper van roof

Unfortunately the Sikaflex 521UV would not be suitable

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Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml

Sika Sikaflex 521 UV – Weathering Resistant STP Adhesive Sealant – Multipurpose – Low Odour – Age And Weather Resistant – Light Grey – 300ml

Product ID: 57255900

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Details

Colour
Light Grey
Brand
Sika
Item weight
0.42 Kilograms
Liquid volume
300
Full cure time
3E+1 Minutes

🎨Paintable & sandable finish

🌦️Superior weather & age resistance

🛠️300ml professional-grade cartridge

Description

🛡️ Seal the deal with lasting strength and style!

INDOOR OUTDOOR READY - Durable light grey sealant perfect for both interior and exterior applications.
SAFE ADAPTABLE FINISH - Solvent-free, low-odour, and paintable for seamless integration into any design.
VERSATILE BONDING POWER - Bonds timber, metals, ceramics, plastics—no primer needed, saving you time and hassle.
WEATHERPROOF YOUR PROJECTS - Flexible polymer formula resists ageing and harsh weather, ensuring bonds that last.
BUILT FOR PROS TRUSTED BY EXPERTS - Engineered specifically for professional applicators demanding precision and reliability.

Sika Sikaflex 521 UV is a 300ml professional-grade, weather and age-resistant STP adhesive sealant in light grey. Its flexible, solvent-free formula bonds a wide range of materials without priming, cures to a paintable and sandable finish, and is suitable for both indoor and outdoor use, making it the go-to choice for durable, multipurpose sealing.

Specifications

Manufacturer	Sika
Part number	62139
Item Weight	420 g
Product Dimensions	5 x 5 x 21 cm; 420 g
Item model number	512UV
Size	300ml
Colour	Light Grey
Style	single
Material	Polyurethane Silicone silicone Polyvinyl chloride
Volume	300 Millilitres
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Specific uses	Professional
Included components	1 cartridge
Batteries included?	No
Batteries Required?	No

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