Description
Selleys Flexiseal FC is a fast-curing polyurethane sealant and adhesive in white, supplied here as a 600ml sausage for sealing and bonding jobs around the building site or the house. It does two jobs in one product: it seals joints between common building materials and bonds them, and it stays flexible enough to cope with the movement those joints see through the seasons.
About the formula
A single-component polyurethane with a non-slumping body, so it stays put in vertical joints instead of sagging. It is designed to grip common building surfaces without a primer, cures to a waterproof, flexible seal and can be painted once cured. Selleys rates it for joint movement of around plus or minus 25%.
Where to use it
Indoors: joints between wall and ceiling elements, around door and window frames, and acoustic rated walls, plus general bonding of building materials.
Outdoors: weatherproofing joints between brickwork, masonry, concrete, timber or metal frames, sealing around roofing, retaining walls, external wall and cladding joints, and expansion joints.
Suitable materials include concrete, brick, masonry, ceramic tile, metals, softwood and hardwood, plus some plastics (test other plastics and rubber first).
How to use it
Make sure the joint is clean, dry and free of dust, oil and other contaminants, and use a backing rod in deeper joints. Cut the end of the sausage, load it into a sausage-style applicator gun and extrude the sealant so it makes full contact with both sides of the joint, avoiding trapped air. Tool the surface smooth with a spatula before a skin forms. Once cured, it can be painted. For outdoor work, a suitable exterior paint will help the finish last longer.
Important notes
Will not adhere to polyethylene (PE), polypropylene (PP) or PTFE. Do not apply when the air or surface temperature is below 5°C. Not suitable for permanent water immersion or below water line use. Not intended for structural applications or general glazing. Avoid alcohol and solvent cleaners on the sealant while it cures, as they can interfere with the cure. Very damp substrates can cause bubbling in the sealant. It may affect the drying of oil or alkyd based paints, so test paint compatibility first. White sealant can yellow slightly with age and sun exposure. Store unopened sausages below 30°C in a cool, dry place out of direct sunlight, where they keep for around 12 months from manufacture. Opened sausages may skin over near the opening, so discard any lump or skin before using the rest.
Specifications
| Brand |
Selleys |
| Product |
Flexiseal FC Polyurethane Sealant & Adhesive |
| Size |
600ml sausage |
| Colour |
White |
| Base |
Polyurethane (single component) |
| Application |
Sausage, via sausage gun |
| Joint movement capability |
Plus or minus 25% |
| Minimum application temperature |
5°C |
| Shelf life (unopened) |
About 12 months below 30°C |
| Use |
Interior and exterior |
Safety
Polyurethane products can still irritate the skin, eyes and airways, so wear gloves and safety glasses, work with good ventilation and avoid prolonged skin contact. Store in a cool, dry, well-ventilated place away from heat, ignition sources and food, upright and tightly closed. Keep out of reach of children. Refer to the Safety Data Sheet (SDS) for full details.
