Paul's Chrome can chrome plate fiberglass.

I first heard about it on My Classic Car (Dennis Gage).

http://www.paulschrome.com/index.php/what-we-do/surfaces-we-plate

From their website.

Surfaces We Plate
Each part provides its own unique set of challenges. Here at Paul’s we are experienced at repairing, polishing, and plating a wide range of surfaces, including:

Pot Metal (Zinc Diecast)
Aluminum
Steel
Stainless Steel
Cast Iron
Brass
Copper
Lead
Fiberglass

Contact us for a free estimate!