Hey! So about a month or two ago I picked up an old 45 gallon aquarium from somebody who was throwing it away. The tank was in pretty horrible condition and seemed to have rarely been cleaned. Both of the filters that it came with were filled with muck and the bottom of the tank had about an inch of water, but i could not see through it.
After cleaning out the tank, I saw that the silicone was worn down in some areas and peeling in others, so I scraped off all the old silicone that I could with a razor blade and resealed with DAP 100% window and door sealant and allowed it to cure for two weeks. Yesterday I filled the tank up a little bit and let it sit, to see if it was alright. Today the silicone that is under the water is white and puffy, and when I poke it, it peels off just from a poke.
Any advice would be helpful since this is my first try on resealing.