Filling Up The Roll Bar, ...with expansion foam... Options

[McMark]

I've read a bit about sound deadening and one technique is to fill hollow spaces with expanding foam to kill resonance. I was thinking of doing this to my roll bar top and maybe the sides. Knocking on the top shows how high of resonance it has. I was think that if I drilled some hols 8-10 inches apart on the underside of the roll bar and sprayed in the foam I could kill the resonance and just fill in the holes. I'm not sure I could weld them since the foam is in there, but maybe solder or lead them in, or maybe just bondo?

What's your reaction to this? Good or bad idea?

[sechszylinder]

HiLow Mark,

in my opinion this is a very very bad idea !!! (IMG:style_emoticons/default/barf.gif)
It took me 4 days to get rid of all the foam the factory put in my car and i found lots of surface rust behind that foam.
Andy, this is not that kind of "hohlraumversiegelung" that i have in mind. I'm using wax based products for rust prevention.
Jeroen, you're absolutely right; a 914 owner has to live with the fact that this car is noisy, especially when the roof is open (IMG:style_emoticons/default/wink.gif)

Benno (IMG:style_emoticons/default/smilie_flagge6.gif)