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Hood Sheet Metal Separated From Support


Cruzr
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  • 9 months later...

The purpose of the material that is between the hood skin and the frame members under the hood is to keep the skin from vibrating and "booming".

 

I recently started to work on restoring my trunk lid and my friend at the body shop who is helping me with the project recommended replacing the original material with the dual-mix flexible urethane foam currently made by SEM for that exact purpose.  It comes in a dual, side-by-side tube that mixes as you depress the trigger, through an internally intertwined, replaceable, dispenser nozzle.

 

We dug out the old material, cleaned the surfaces, then masked both sides of the target areas and then applied the urethane foam.  Once it cured a little (about two minutes) I then sliced away the excess to get a nice flush finish.  A couple of cautions:  there are only about 30 seconds of working time and it sticks like crazy.  If you don't keep the material flowing it clogs up pretty quickly and you have to use another nozzle to get it to flow again.

 

Here is what it looks like:

 

post-45192-0-69837500-1395262248_thumb.j

 

post-45192-0-08779500-1395262282_thumb.j

initial masking of target edges

 

post-45192-0-21103700-1395262322_thumb.j

additional masking to prevent spending time on cleanup from possible drips, etc...and foam applied.  On the left side of the photo, you can see how the foam has expanded and will have to be sliced out for a better appearance. This urethane foam, although it expands, will not bump out or bow the metal skin.

 

post-45192-0-81323400-1395262954_thumb.j

Result after cutting out excess and removing masking tape.

 

post-45192-0-46451100-1395262981_thumb.j

Finished prepping of underside of trunk lid, including the separate seam sealer around the outside skin edges.

 

Another word of caution.  Be very careful as to the type of adhesive or urethane that you use.  Many of these products will expand after application and you will end up with a noticeable "bump" or "stretch" on the outer skin of the hood.  You also don't want something that ends up completely ridgid.

 

Another bonus is that the SEM two-part flexible urethane will not deteriorate like the original factory material.  It's not cheap but you won't have to do it again.

 

Regards, Maurice.

Edited by schoir
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