ProofBase SBR screed primer is the ideal primer for floor preparation prior to the application of ProofTherm Insulating Screed. It provides a flexible mechanical and chemical key that promotes the adhesion of any screed and which is a crucial component for a high standard finish.
ProofBase SBR primer is a latex style primer which provides protection against water ingress but should not be relied on as the primary waterproofing measure.
Primers are often overlooked but form a critical part of a screed application. For any screed to form a solid bond with its substrate, it needs to cure at a controlled rate that allows the chemical reaction through which the bond is formed enough time to complete. Primers also effectively deal with dust which stops a good bond from forming. Screeds that are not well bonded to the substrate are at greater risk of cracking and eventually failing.
Apply with a roller or large brush and mix with clean water at a ration of 1:1. Do not apply un-diluted as this ,eaves a shiny surface which can reduce adhesion