Review on 🐠 SELSIL Clear Aquarium Silicone Sealant - High Elasticity, Fish-Safe, Solvent-Free Silicone Polymer, Ozone-Resistant for Freshwater and Saltwater, Transparent 10.14 Fl oz, 1 Pack by Samantha Hervey

very difficult to apply. You need a caulking gun to get it out of the tube, but I would apply it with my finger pointing backwards. it is extremely difficult to remove the excess, which indicates its liability; But I would just buy a small tube of Petco's Aqueon Sealant, even though the price is the same. I doubt you'll need it anyway, he's got plenty left after resealing 39 gallons. a few weeks tried with a glass scraper to remove the excess. If you're confused, spraying the excess with white vinegar will help to scrape it off a bit, but you'll need a glass scraper. If you know how to use a caulking gun accurately and build a tank from scratch, I recommend this. To reseal an existing tank, use a small tube of Aqueon sealant. Don't buy GE or Loctite, they are not safe for fish.