its made by Silver Dollar and it comes in a five gallon can and you apply this over the top of the trailer with a special mop. This stuff is silver in color and will self level and seek out the hole if applied according to special instructions. The key is: There is small particles of metal in this solution and it must be kept stirred up all the time. you need one person to mop this on and another just to stirr it up. You stirr from the bottom up keeping the stuff well mixed. This stuff is great and very messy. You throw away the mop, any clothes and wear gloves and long sleeve shirts and pants. The material is not caustic or toxic it just won't come off.
You will probably need about 5ea of five gallon containers, its like honey in consistency.