Our Manubric installation products have been carefully selected and tested to ensure a high standard of quality. When installing Manubric’s adhesive on fireplaces, we recommend using a polymer-modified mortar instead of ours. It will support the temperature variation and will last longer. You can also follow the guidelines of your heating unit supplier for better performance, as each unit has its own characteristics and a different BTU emanation. Manubric's. The Manubric's adhesive is heat resistant. Coverage:Manubric Adhesive *:- 4 L covers an approximate area of 25 sq. Ft.- 13.25L covers an approximate area of 80 sq. Ft.*The area covered by the adhesive depends on the amount used during the application. See the technical specs here for French. See the SDS here for French.