Designed specifically for shielding detector loop wires, our 3M Detector Loop Sealant 5000 cures to a tough rubber surface that encapsulates, insulates and protects while resisting weather and chemicals. Applied right from its ply pack, it hardens smooth without finishing and stays strong and flexible even in extreme temperatures. The sealant bonds with virtually any concrete or asphalt surface. - Applied right from its ply pack, it hardens smooth without finishing and stays strong and flexible even in extreme temperatures. The sealant bonds with virtually any concrete or asphalt surface.