Is a coating or sealant on the concrete acceptable as PERC-impermeable?
This depends on the type of coating/sealant used and whether it is properly applied and maintained. Epoxy-based sealant, phenolic floor topping and vinyl ester products have been used but their long-term effectiveness is not proven and they require proper application, periodic maintenance and re-coating. The dry-cleaning machine or container must still be lifted up in order to apply the coating/sealant under the machine or container. The anchoring of the dry-cleaning machine, tank or other container within the secondary containment system may also result in damages to the floor sealant/coating layer or the underlying concrete and subsequent seepage of PERC through the cracks and crevices along the anchoring points. Contact the supplier(s) for advice and warranty regarding the use of coating/sealant. 5.12. Is steel considered PERC-impermeable? Although ordinary steel is considered to be PERC-impermeable, the build-up of moisture in the PERC will lead to acid formation and corrosion whic
