CAN ANYONE HELP ME ?? I NEED TO KNOW HOW TO MEASURE THE AIR SPACE IN A RATHER LARGE AND ABNORMALLY SHAPED FIBERGLASS ENCLOSURE FOR 3-15"... ANY IDEAS?????
I would forget the plastic bag idea personally because its only fiberglass and if you pour water in directly then you can find any leaks. When i did mine i started off with plastic bags and they just ripped all apart and come to find out i had a leak in the box.