Unika Top Seal Black Msp Topseal. This Unika top seal black msp topseal is ideal for sealing the area between worktops & walls. to use ensure area to be sealed is dry & free from dust & grease. apply an even bead of topseal along the area finished & smooth using a smoothing tool or soft scraper. clean up with acetone or another solvent. allow to cure for 24 hours before use. Water resistant when cured.