Primers and sealers — specification and technical data

The primer and the sealer are part of the system, not an accessory to it. Most finish failures we are called to inspect trace back to the wrong primer, or a sealer applied before the substrate was dry enough. Both carry their own data sheets and both belong in the specification.

Priming and sealing sequence

The moisture reading, not the calendar, decides when the sealer goes on.

Specifying a material into the wrong place is the most expensive mistake on a finishes package. These are the limits we will raise at review whether or not they are asked about.

Primers and sealers: Cemher Primer 100 adhesion promoter applied undiluted at 6–8 m²/L, first finish coat applied not less than 30 minutes and not more than 8 hours afterwards. Finish sealed with Cemher [Maxipur 100% two-component polyurethane in matt / satin / gloss] at 8–9 m²/L, applied not less than 24 hours after the finish has hardened and only when substrate moisture is below 5% measured by meter. Recoat interval 4 hours, maximum 3 days.

Square brackets mark the choices that belong to the project. Send us the finishes schedule and we will return the clause completed, with the sample and mock-up programme against it.

We supply the material and we apply it, so the specification and the workmanship sit with one party. Send a finishes schedule, an elevation or a mood board and we will come back with the system, the build-up, the sample programme and a completed clause.