Unika Topseal Clear Worktop sealant 290ml. This Unika topseal clear msp topseal is ideal ensure area to be sealed is dry & free from dust & grease. apply an even bead of topseal along the area to be finished & smooth using a smoothing tool or soft scraper. clean up with acetone or another solvent. allow to cure for 24 hours before use.. Once cured the joint is completely waterproof.