Picked up my car a month ago and took it in for paint protection soon after. I got Xpel on the full hood and fenders because I didn't want to see a line. Then I got Opticoat over the whole car. Now for the dumb question. With my untrained eye, I can't tell the Xpel is there. When I pop the hood, I can see what looks like the edge of a transparent wrap around the sides, so I believe they did put it on. But how would I know without looking under the hood? And how can I convince a potential buyer that it's there, other than showing them the receipt? What would I be looking for? Is there a difference in reflection at certain angles or some other indicator, or is it really that invisible?