i have a few old cars and trucks,,,i used por 15 on a 91 toyota and it lasted about 8 months,,i used the eastwood on all my other cars and it holds up great,,,i did the inside of a truck on my 67 nova with the eastwood and the car sat outside with no truck lid on it for 2 years and it still looks like it was done yesterday,,,,,,i personally think por 15 is a waste of money and way over rated