In Reply to: Best way to remove trunk gasket? posted by Jonathan on August 24, 1999 at 07:38:01:
I have a 1986 model 528e with 140,000 on the odometer.
I was getting some water leakage into the truck and tracked it down to a rust area under the trunk seal on the lower left edge.
I pulled up the seal. It tore about every 8 inches but was easy to get started again. I used a screwdriver as an aid in lifting up the seal but be careful not to scratch the paint under the seal as it could lead to rusting.
After the seal was removed there was quite a bit of residue from the old glue. It is a must to get the 3M adhesive remover before starting this job. Place paper towels into the seal groove and then pour the adhesive remover onto the paper towels. Wait about 10 minutes and then the glue residue will come off relatively easy. Just wetting a rag and wiping the seal groove without the waiting/soaking period is not very effective.
I think you might be surprised to find rust buildup in the seal groove that you couldn't see. Be prepared to take care of this rust before putting a new seal in. Besides the one known area I had, there were three other areas with significant rust buildup. On of the three areas had small holes all the way through the sheetmetal. I live in the Houston area so this rust is not winter or salt related. The basic design just allows water to be trapped under the seal and over the years the rust can form.
I ended up fiberglassing the one area that had severe pitting through the sheetmetal. The rest of the rust was cleaned up and then the groove was painted.
I used the 3M super weatherstrip adhesive. This stuff is a pain to work with but it does do the job. You use your finger and put a thin coat on the seal groove and the seal and then let it dry. Then you install the seal into the groove. I assembled the seal in the groove before applying adhesive and using masking tape on the side of the groove, I placed tick marks around the seal to note the location of the seal relative to the groove. This way as I installed the seal, I could be sure I wasn't pulling too much at any point and running into a problem as I approached a corner.
I placed adhesive on the bottom of the seal as you would expect. I would also recommend placing a thin coat of adhesive on the outer lip of the seal that will contact the seal groove. Be sure to particularly place adhesive in the upper corners.
It is messy but a good job can be done.
Good luck. E-mail me if you have any further questions.