We Received your 1 gallon jug yesterday. Today I reviewed a few of your YouTube videos, I followed them and was amazed how easy it was to apply. My RV is 4 1/2 years old and I developed a small leak, so I decided to seal up all the openings on the roof. It took me a little over and hour, start to finish. It applied so easy and has now relieved my fears of more water coming into my RV. I also love the fact that everything needed was in the box. Awesome product!!!