Interior: You may want to seal Romanit in high traffic areas such as kitchens, hallways or bathrooms, but remember that using a sealer will eliminate the beautiful, soft texture and appearance and provide a more uniform “satin” sheen. Use Keim Sealer if you want to protect Romanit on interior walls.
Exterior: We do not recommend sealing Romanit outdoors. It is naturally vapor permeable and will allow any moisture vapor that collects in masonry walls to escape unimpeded to the environment, while providing a weather-resistant finish. The natural beauty of Romanit would also be diminished by use of any sealers.