One evening while we were out I had a 30-40 gallons spill with the 300 so I decided to do something in case this happens again. I need the sump area to have the ability to hold 5-10 gallons of water. I was contemplating between fibre glassing, vinyl enclosure, water proof paint than I came across a product called liquid rubber. Its none-toxic and aquarium safe, people use it to seal plywood tanks and the best part is it's made in Canada!
Sold at home hardware store and its reasonable pricing. 16-24 per pint for a 24x24 foot print.
