After working with those add on lips I decided to see what happens if I fiberglass on as a spoiler.
Day one tape off areas and align the spoiler lip.
Apply resin and fiberglass.
Sand it down and add more fiber glass.
Day 2
second layer of fiberglass dry
More sanding
Day 3
Add some bondo body filler and sand. Lots of sanding.
Day 4
Put the spoiler back on the car so I can go to work.
Day 8
This project was such a pain. Lots and lots of sanding. Paint dried funny creating cracks so I need to resand it again when it warms up then paint. Looks kinda wavy but not bad for a first timer and I think it looks cool.