I buy a 5 gallon pail at a time, and spray it with an old sand blast nozel, on a crew cab longbed truck i us 2 gallons, and unlike other products it doesnt drip off the chassis. reading this post the spray can doesnt smell bad, a 5 gallon pail smells some fierce, takes a few weeks for the smell to dissipate on the daily driver. a 5 gallon pail at napa is around $150, my number one enemy living in the north country is rust, so i spray everything! I have a one ton in the yard with no body on it that got sprayed last year, and you can still see that it got applied, after a year of rain and snow and sun with no cover to protect it.:thumbsup