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Hi gang
Found remedy for my cracked polypropylene gas tank. I used a product called Plastic Cote. You can buy it at Discount Auto Parts. First of all, I sanded the tank with coarse sand paper around the cracked area of the tank, then cleaned with acetone. I took a bar of soap and rubbed it into the crack to stop the leak temporarily. Since the plastic needs to be warmed, not hot, in order for this product to work and you obviously can't used a flame on a gas tank, I used a blow dryer to warm the area around the crack. I then kneaded the Plastic Coat until it was a uniform color (gray). I dampened my hands with water so it wouldn't stick to my hands while applying. To apply the Plastic Cote, I pressed it into the crack and then smoothed the edges out away from the crack. The instructions said curing time is one hour, but I waited for a day before filling tank. It's been two weeks and two tankfuls of gas, and no leaks.
There is a website for this product - plasticote.com (sp.?)Thanks to everyone for all of your advice and helpful suggestions. Happy camping! Bobby & Lisa Smith