What product should I use to seal a thin crack in my engine hatch cover? It flipped open today, snapped the strut out of the ball joint, and hit the lifting ring, which caused an 8" hairline crack to appear on the bottom center interior of the hatch (thankfully not the exterior, although it did leave a slight depression). I'd like it to blend in with the white as much as possible so it's not so obvious, even though the inside of the hatch is not finished off. Thanks!