Primers will improve the application features of self-levelling smoothing compounds. They regulate the premature drying of adhesives and smoothing underlayments. You should also consider applying DPMs (damp-proof membrane) prior to your hardwood flooring installation. DPMs are laid over concrete slabs to protect moisture-intolerant flooring solutions from being affected by it. F-Ball has great solutions for both primers and DPMs that will safeguard your new flooring and will definitely prolong its life-span.