Reading about bumper repairs prompts me to share my repair experience working on the rear fibreglass bumper of the van I now have owned for over two years.
Photos are posted here:  http://community.webshots.com/myphotos?action=viewAllPhotos&albumID=158855270&security=KpGfng
Sorry for that horrendous URL.
The PO did a rather good repair using black ducttape.  I inquired about a new fibreglass bumper replacement and was informed they are $800. or more.
This was my first attempt at fibreglass work, I thought it turned out rather well, and as a bonus you can get pretty high breathing the fumes.  I used flat black bumper paint in a spray can to complete the job.
By the way, one of the nuts that are welded to the inside of the bumper brackets had come loose.  I Bremmelled off the bolt and then BJ welded a new nut in place.

Ed Wiebe
1990 Westfalia