u need to get that smooth as possible man..... almost as smooth as if u were gonna paint it.....use something called Mineral Sprits to help u takje the glue off......then scrape..... when i did mine this was the part that took me the longest to do...... u have to get it smooth so when u lay the vynil over it there will be no bumps..........i used a pressure washer,sandpaper,metal scraper,and mineral spirits to get it off...
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