Just had my 76 stingray soda basted and ordered a set of L88 fender flares for the rear to add some extra meat. The flares are molded fiberglass. Need to know the best adhesive to secure the flares to the body. I plan to reinforce the underside with fiberglass mat but also need to know what the best filler with the minimal amount of shrinkage to use to finish the top side in prep for primer and paint. I have been looking at the Evercoat Rage Extreme 120 but it gives no info on fiberglass use. I have also been looking at the Duraglas short strand but have no idea of the finish characteristics. Whatever I use will need to be easy sanding for contours and have minimal shrinkage. Suggestions please….