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I did mine just to be on the safe side however id suggest you be a bit more careful than me and mask off a good portion of the area under the top to avoid overspray going on other areas of the car. I got quite a bit on my rear window and its a pain to get it off...after several washes it STILL exists
As for your other questions....
Yes most likely you do have to go to a boat/marine store or order it online i dont think other stores would carry it
Yes its pretty much spray on easier to deal with when its hot and the suns out just keep it away from water/dew for a day so it cures properly
Overspray on anything is fine as long as you wipe it out quickly dont let it cure
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