Everbuild Everflex Weather Mate Gap Filler & Adhesive 295ml

In-Depth Look

Everbuild Weather Mate is an exterior sealant for perimeter sealing and general weatherproofing. Unlike silicone, it can be overpainted (check the data sheet).

Performance in Exterior Conditions

The permanently flexible formula is the main selling point. External joints are subject to thermal movement, which rigid fillers can crack under. Weather Mate is designed to stay flexible and accommodate this movement. It is available in clear and other colours, and the ability to overpaint gives decorators control over the final appearance.

Application and Workability

Everbuild’s data sheet gives a skin time of about 15 minutes at 20°C, so tool it off before then. Everbuild says it can be applied in wet weather and to damp surfaces; check the data sheet for suitable surfaces and for submerged use. Full cure time depends on temperature and joint depth.

Verdict

Everbuild Weather Mate combines flexibility, paintability and weather resistance in an exterior gap filler and sealant. Check the data sheet for surfaces and submerged use before choosing it over silicone.

How It Compares

Everbuild Everflex Weather Mate Gap Filler and Adhesive comes in a 295ml cartridge and is sold in several colours. The data sheet gives a skin time of about 15 minutes at 20C and a cure rate of about 2mm per 24 hours. It can be applied in wet weather and to wet surfaces, and once cured it can be overpainted with most paints and woodstains. The data sheet lists an elongation at break of about 350%, a Shore A hardness of 22 and a service temperature range of minus 25C to plus 95C.

That makes it a flexible filler for exterior gaps, such as around window frames, fascias, cladding and door frames, where timber and other materials move a little.

The main point is the choice between a product you can paint and one you cannot. Silicone is often used in kitchens and bathrooms for that reason, while a paintable gap filler suits places where the finished colour needs to match the surrounding paintwork.

Do not treat it as a sealant for permanently submerged areas. The data sheet describes its uses, so check it before using the product in an unusual spot.

Joint size matters as well. Because cure rate is about 2mm per 24 hours, a wide, deep gap takes a long time to cure all the way through, so it is usually better to pack a deep gap with a suitable backing material first, rather than filling it with sealant alone. Check the data sheet for the recommended joint dimensions.

Common Questions

Can I paint over it, and when? Yes. Once cured, it can be overpainted with most paints and woodstains, according to the data sheet. Cure rate is about 2mm per 24 hours, so a thick bead needs longer. If in doubt, test a small patch.

How long does it take to skin and cure? The data sheet gives a skin time of about 15 minutes at 20C and a cure rate of about 2mm per 24 hours. Cooler or damper conditions can change those times, so allow extra if the weather is cold.

Can I use it on damp or wet surfaces? The data sheet says it can be applied in wet weather and to wet surfaces. Surfaces should still be free of loose dirt, dust and flaking paint so the product can grip.

How do I get a neat finish? Run masking tape along both sides of the gap, cut the nozzle to a size slightly smaller than the gap, and apply a steady bead. Smooth it with a tool or a gloved finger, working within the skin time of about 15 minutes at 20C. Peel the tape off before the sealant skins over.