Any particular brand???
I've seen Quaker State undercoating in bulk 35 lb containers at body shops..not sure if they still sell it or not..Also have seen SEM brand in gallon jugs at body shop supply stores--pretty sure they can order larger sized containers..Ziebart had barrels of it in bulk at their places that did undercoating,but again,not sure if they are still around either..I've used 5 gallon pails of roof an foundation coating on a few trucks--it lasted about as long as anything else I tried..about 5 years is the average lifespan of POR-15,undercoating,"chassis" paint,etc..the silver stuff used on mobile homes holds up good..best part is its cheap at Lowes or Home Depot..only 20 bucks or less for a 5 gallon pail..can do a whole truck and frame with one pail...
