I missed this thread last month.....
Anyway, I have been repairing/restoring an old, damaged S4 door that I got from Greg Z. as a way to teach myself about working with fiberglass.
One problem that needed fixing was that the two halves of the shell had started to separate - with a healthy split about 6 inches long, from the front of the window frame down to the top hinge plate bobbins. On the advice of the leading specialist fiberglass supplier in Mass I bonded it back together using epoxy resin+hardener mixed with thixotropic thickener (enough so that it didn't run all over the place). The store owner told me that the bond would be stronger than the fiberglass and it appears to have worked very well.
Clean & roughen the two surfaces first. Clamp the surfaces together but don't over clamp to the point where you squeeze all the resin out. I used a row of bulldog clips. It's solid in 24 hours & reaches full strength in three days.
Interestingly, according to Mick Miller's how-to-improve-the-door-fit article, when Lotus glued the door halves together they also used a couple of pop rivets, just in front of the window frame, to hold the flanges together (see picture). Mick doesn't mention if this was for all Elan series, but presumably it was for S3/S4/Sprint at least (although Greg's door showed no sign of them ever having being there).
I don't know if they were used simply to aid the assembly process or whether they are (ha!) structural. Either way, I'm vaguely looking to fit them, if only for originality. Does anybody happen to know what type of rivets they are? I don't think they look like yer average rivet.
Nick