Making a mold?

So Im going to make a replica of the existing spoiler on my car out of fiberglass but first i need a mold.

How would i go about making a mold of the spoiler without damaging the paint and what not on the spoiler?

Thanks,

here's the spoiler

May I ask why you want to make a replica of the factory spoiler? It looks fine in the picture. Unless you are just trying to find out how to make a mold. But anyways good luck on the project post some pics of how it is going.

Sounds alright, but modeling clay? come on...

This is how alpine prepares the surface to make a mold. 1. Cover entire area with 3m green masking tape, make sure to overlap and not miss any areas. 2. spray adhesive onto masking tape and cover with aluminum foil. Now you are ready to make the mold out of fiberglass. Also due to the shape of the spoiler you will need to make a 2 part mold with the part line coming off of the rear leading edge. This process should not harm your paint, but it could. Last, if you have not worked with fiberglass than you should probably try a much smaller project for experience before hand. I will also suggest finding a used spoiler from a wrecking yard to use just in case damage does occur, your car looks very nice and wouldn't mess with.

By the way, Alpine covers all of their cars on their web site.

Sounds alright, but modeling clay? come on...

Well that was all I could think of as far as clay I guess you could some type of plaster too.  I dont know ive never done a mold so im just guessing here.