Ricks MantaProject.com build log

[Blueovalz]

I had a similar problem with a previous car. Solution was to bond 1/4" ID fiber tubes (you could use larger if needed), one on each side, about 1" long each, into the fiberglass panel, and sanded flush with the top side surface. I slipped vacuum hose on the underside ends. Rain (or wash) water would drain down these small holes and out the vacuum tubing directed out under the car. The holes were barely noticeable, and served the purpose well. I used fiber tubes from McMaster.com because they would bond well with the fiberglass. I would hate to see you take the rear lip off.