Fiberglas gurus: How do you fix these? Options

[Wanna9146]

I'm going to rivet my fiberglas flares to my car (like this):

(IMG:http://img.photobucket.com/albums/v639/genevawatch/Porsche%20914-6/f901_1.jpg)

But, my flares are full of holes (previously attached with Dzus fastners):

(IMG:http://img.photobucket.com/albums/v639/genevawatch/Porsche%20914-6/flares2.jpg)

(IMG:http://img.photobucket.com/albums/v639/genevawatch/Porsche%20914-6/flares1.jpg)

The backside of the flares have to remain flush as they will be resting against the body. I'm guessing I use masking tape on the backside and fill the holes with Kitty Fur, then resin. Sand, repeat?

[scotty b]

Sand the backside down to good clean glass, lay up one piece of fiberglass MATT once setup, bevel the holes out on the opposite side. Cut several discs gradually increasing the diameter. Starting with the smallest disc, apply a light coat of resin to your hole, lay in the first ( smallest ) disc, wet it until it becomes transparent, then repaet with each larger disc until the hole is fairly level. Once setup fully sand the glass with 80 grit and give it a wipe of bondo.

[Wanna9146]

Sand the backside down to good clean glass, lay up one piece of fiberglass MATT once setup, bevel the holes out on the opposite side.

If I put a layer of matting on the backside, won't that keep the flares from sitting flat/flush with the (metal) fender?