I have not read every last word in these, but have found something relevant in each. Hopefully we'll get the sense out of all of them into the thread.
http://www.thegoldenbug.com/en/vw_te...lass_for_paint Preparing fibreglass for painting quick step by step guide
http://www.superchevy.com/how-to/cor...p-paint-guide/ General description on how to approach things
http://www.lotuselan.net/forums/elan...ss-t12358.html Lotus forum with various responses to OP, much like here
http://www.rcscalebuilder.com/Tutori...ssForPaint.pdf 5 page guide with pics
http://www.awlgrip.com/support-and-a...iberglass.aspx Basic supplier guide with link to more detailed guidance
It's a start anyway.