Selleys N Mastic Sealant is a non skinning poly-butene based compound that serves as an excellent barrier to moisture vapour. This non-hardening sealant remains permanently flexible and is suitable for sealing concealed lap joints between plastics, metals, timber, glass, masonry, and expanded foam panels.
 
Good adhesion to most substrates
Microbe resistant formula
Withstands temperatures of -40˚C to +80˚C
Low shrinkage