Toggle Nav
My Cart

Firestone Water Block Sealant

£9.85 £8.21

For sealing under compression

Specific use with termination bars and pipe boots

Applied with a mastic gun for accuracy

Firestone Water Block available to buy online from AquaLiners Direct

Firestone Water Block is used to seal up edges and provide additional protection from water getting in behind the pond or lake liner where the seal will be under continuous compression.

It is specifically recommended for sealing behind termination bars when vertically fixing pond liner to a wall, and for around the inner edge of Pipe Flashing where it fits around a pipe. Water Block comes in tubes for use with a mastic gun making it easy to apply accurately where required.

Firestone Water Block, although safe for aquatic, animal and humans, is a solvent based sealant and should therefore be used with care. We would recommend you read through the Water Block Technical Information Sheet prior to use; this covers all safety precautions to take and full instructions for use.

Size Guide

Firestone Water Block comes in single tubes.

Each tube covers approximately 3 linear meters.

Technical Specification

Brand Firestone Water Block
Use With All EPDM liners (Firestone & SealEco)
Size Tube
Other Sizes Available No

3 linear metres

Aquatic, plant & human safe Yes
Solvents Heptane
Technical Information Sheet Water Block Sealant

Behind Termination Bars

Pipe flashing and detailing


All our liners are sent out with full installation instructions. You can also find guides to building and installing your liner in our Help & Guides: How To section.

For larger projects, we can provide assistance with installation if required. This can either be undertaken by us or one of our partners. For more information, please see our Pond Liner Installations section or contact us.

Write Your Own Review
You're reviewing:Firestone Water Block Sealant
Your Rating

You may also like

Firestone Lap Sealant

Used to stop water getting behind liner edges and seams

Easy application with mastic gun

Use with termination bars and QuickSeam products

EPDM Pond Liner Repair Kit

Everything you need to repair small holes in your pond liner

No need for hot bonding

Durable, proven system

EPDM Pond Liner Joining Kit

Everything you need to join up to 2m of liner

Great for streams or waterfalls

No need for hot bonding