NP-666 is a neutral cure, cost effective one part silicone groove filler for exterior and interior. It has excellent adhesion to most building materials, good UV and weather resistance. It has short tack- free time and good expansion and contraction capability. Applications Sealing of joint between Glass, Aluminium, ACP, UPVC etc. Sealing of joint between Concrete, Brick, Tile, Wood, Laminates etc.