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[GMCnet] GMC Foam Insulation Removal [message #260968] Fri, 05 September 2014 09:40 Go to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
G'day,

I was up at Chuck Boyd's place the week before last gutting my parts Avion. When it was all stripped it looked like The Blue Streak
in Australia.

I noticed what a crappy job the factory had done with the spray insulation which was the same as The Blue Streak and a light bulb
came on:

"I wonder if I can strip the insulation using a high pressure water washer and if yes would it be easier / quicker than using
mechanical means to cut and pry it off in pieces."

Here's the answer:

https://www.youtube.com/watch?v=8KKJ6Ksqlzw

I as you can see it's really quick. John Sharpe and I tried to take another video of me removing the rest of the foam but we'll
never make it in Hollywood as it didn't work.

Suffice it to say that it took less than 5 minutes to remove the rest of the foam from the door. The nozzle shoots out a straight
single stream at extremely high pressure and rotates. I tried a nozzle that had a flat spray at the point where the foam is attached
to the metal but it wouldn't work. The rotating nozzle kinda chops it up as it rotates. The HP washer puts out 2800psi.

Obviously this method can only be used on a gutted coach and would have to be done during the summer so that the water in the GMC
could drain out through the door.

I will be using this method to strip all the foam out of The Blue Streak so stay tuned for the sequel!

This method will make removing the foam so the body can be sold for scrap metal a piece of cake. One word of caution, when I was
done with that small patch I was covered with bits of foam so I would recommend wearing goggles, and a mask when removing the foam
with this method as who knows what's in that foam after 40 years!

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428

PS - YES I realize I'll have to be careful around wires, components, on the "plastic" front and rear cap. YES I realize the same
goes for the fiberglass below the beltline. YES I realize that I'll have to cover the dash board and anything else I don't want
soaked.


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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