J-B Weld Blue Silicone – 85g (31316B)

Description

Genuine J-B Weld · Part no. 31316B

Safety: Danger. Causes serious eye damage. Harmful to aquatic life with long lasting effects. Read the label before use.

J-B Weld Blue Silicone comes in an 85g tube and is a waterproof, mould-resistant silicone that doesn't shrink as it cures. The maker lists it for sealing and bonding windows, lens housings, door frames, mouldings, weather strips and trim; the bright blue makes it easy to see where you've laid the bead and spot any gaps before it sets.

Good to know

• Why choose blue? Mostly for visibility: the bead is easy to follow and check on a dark or cluttered surface. Where it will be on show, black, grey or clear look neater.
• Is it rated for engine heat or oil? The facts give no temperature or oil rating for this tube, so for sumps, rocker covers or anything hot, use a silicone that states those figures.
• When can the part be handled? About 1 hour to set and 24 hours to cure fully; leave clamps or tape in place until it has set.
• How do I stop it squeezing everywhere? Use a thin, even bead; the no-shrink formula means you don't need extra to allow for shrinkage.

Which one?

For an engine gasket with a stated heat rating, Loctite SI5926 Silicone Instant Gasket – Blue (1123349) is rated -54° to 150°C; for a seal on show against black trim, J-B Weld Black Silicone (31319B).

Key features

• 85g tube
• Blue, easy to see as you apply
• Waterproof, mould and mildew resistant
• No-shrink formula
• Sets in 1 hour, cures in 24 hours

Specification