i resealed my 58 gallon and in the precess siliconed a 5 by8 piece of glass over the bulkhead holes to seal them off. waited 24 hours and filled but it leaked at the glass block off plate everything was cleaned and preped with acetone. but i applied thin layer of silicon ll over the glass plate instead of just a bead i believe the outer edges dried but not the inside due to lack of air when i removed the plate the silicone was still wet after 24 hours i cleaned and resald and will test in3 to 5 days.