Adheseal PU50 Polyurethane Sealant

Where does an anti-pick sealant make sense?
PU50's Shore A 45 hardness resists picking and abrasion, which suits schools, public buildings, and other high-traffic joints.

Can PU50 go below the waterline?
Yes, once it is fully cured. It also takes constant movement and vibration, which suits marine work.

Why can I not use it in a closed space?
It cures by reacting with moisture in the air. In a totally confined space it will not cure properly.

Can I paint over PU50?
Yes, once cured, with acrylic, oil, or rubber-based paints. Non-flexible paints may crack under joint movement.

Does PU50 need a primer?
Often no, but roughened non-porous surfaces take Adheseal 50A and porous surfaces take Everflex Supaprime. Always run an adhesion test first.

Shore A 45 hardness suits anti-pick joints in schools, prisons, and other public buildings. Tough, tear-resistant bond takes up to +/- 25% joint movement and constant vibration. Bonds panels and facades and suits civil joints; below-waterline use once fully cured. Resists mould and mildew in hot, humid service conditions, and is paintable with flexible paints.

Prepare dry, clean, sound joints and prime where needed: Adheseal 50A on roughened non-porous surfaces, Everflex Supaprime on porous surfaces. Push the sealant firmly into the joint and tool it with a moistened spatula before it skins. Design joints to a 2:1 width-to-depth ratio, minimum 5 mm internal and 10 mm external, and use a closed-cell backing rod 25% larger than the joint where it is deeper than 10 mm. Clean wet excess off with xylene, and remove cured sealant mechanically.

Do not use it in internal swimming pools, and avoid high chlorine levels. Do not use it in totally confined spaces; it needs atmospheric humidity to cure. Not for aquariums. Not for structural glazing; use Adheseal N-80 or N-60 glazing silicone. Not for mirrors; use Adheseal High Power 609, and test first. Not for bitumen, natural rubber, EPDM, or materials that leach oils, plasticisers, or solvents. It can discolour copper and brass; test lead and copper first, and stain-test natural stone. Composite panels need testing first. Do not apply where moisture vapour comes off the substrate; it can bubble. Keep uncured sealant away from cleaning agents, solvents, and alcohol. Apply between +5°C and +35°C.

• Suits: Concrete, masonry, brick, stone, timber, metals including stainless steel, aluminium, and galvanised steel, plastics, fibreglass, porcelain, painted surfaces, powder-coated profiles, and waterproof membranes.
• Rubber: Compatibility dependent. Not natural rubber or EPDM.
• Non-porous: Slightly roughen, clean with the two-wipe method, then pre-treat with Adheseal 50A and wait 30 minutes to 2 hours.
• Porous: Prime with Everflex Supaprime and wait 30 minutes to 2 hours.
• Concrete: Cure for at least 28 days first.
• Always: Do an adhesion test before full application.