Ok don't worry, I thought I f up like you when I sanded all the clear coat down the 1st time and sprayed a 1st clear coat, follow with a second clear coat which made it look too thick and not letting the carbon fibres show thru well. So I started to wet sand it down thinner and hit it with a dewalt polisher. Well, I got one same blotchy spot like you and I thought I'd burned thru. My solution was to resand ALL the existing clear with 400, 800, and wipe it clean with lacquer thinner. This time around, I hit it with just one rich coat of clear and after it dried up, I saw no blotchiness and it turned out flawless. My advice, all you need is one coat and I use flat to match the cf on the competition seats. Actually, rereading your post, I don't think you hit the piece with a clear yet, so why don't you wipe it clean with a lacquer thinner and then just spray the clear and if it's anything like mine, you'll be very happy.