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https://www.swelluk.com:443/swell-silver-label-aquarium-sealer/ 
Swell Silver Label Aquarium Sealer
Swell's Silver Label Aquarium Sealer is used all over the UK to get a better, more watertight and longlasting seal on aquariums. You can get it here at the best prices too.
Product Information
The Swell Silver Label Aquarium Sealer is specially formulated for use with fish tank construction of all types.
This expert sealant must be used on dry, clean and grease free glass to form a watertight, secure seal that will last. Non-toxic and solvent free, it is safe to use and will not leach any unwanted elements into the water.
We recommend using a triangular joint shape and a thick layer of sealant for best results.
Key Features:
- Non-toxic
- Easy to use tube with application nozzle
- Solvent free
- 310ml
- Black Sealant