| Re: [GMCnet] Removing old paint... [message #221505 is a reply to message #221367] |
Sat, 07 September 2013 13:49  |
sgltrac
Messages: 2797
Registered: April 2011
Karma:
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If the original finish is in sound condition and adhering well then there is no need to strip it off. The exception to that statement would be on the smc panels. I found the adhesion on these panels to be somewhat inconsistent. The razor blade method suggested by Keith worked well for me. Mark your razor blades so you know which side was up when you started. The edge of the blade will feather into a scoop of sorts once you start using it but it cannot be seen with my eyes and when you drop it on the ground you might dive back in with the wrong side and that's when you can gouge it badly. Buy a big box of blades and a holder. the holder can be used for most of the surfaces but the complex curves i found easier bare handed. The imron paint is really stable as far as paint films go and being 30+ years old it is done shrinking. The paint adhesion issue on The Pig was between the smc and factory primer. The imron was holding to the primer fine.
Forget sand blasting as you will ruin the coach by pitting the smc and stretching the aluminum. Even an expert with plastic bead blasting will likely wave the aluminum sheets as the spacing of the support ribs is inconsistent. I don't know if the plastic media will ding the smc but I do know that walnut shells will.
Chemical strippers will work well on repainted coaches to remove the repaint but even aircraft remover wouldn't do anything but clean the factory imron underneath on The Pig. Chemical strippers can be absorbed into the smc panels and potentially cause problems later if they are released under the new paint film.
If you have plans to pull and replace windows it would be best to pull them just prior to painting and dry fit your replacements prior to final prep and paint.
Prep what's there if it is sound. Remove only if adhesion or film condition is suspect.
My 2c
Todd Sullivan
Sully
77 royale
Seattle
On Sep 6, 2013, at 3:27 PM, Steve <quadracerx@aol.com> wrote:
>
>
> What is the best method of removing old paint on our GMC's?
>
> Sandblasting
> DA Sanding
> Aircraft Stripper
> OR?
>
> I don't know if my couch is original paint or not, but a long time body man friend told me that the best way to prep is to take it to metal then proceed as needed....
>
> I think Id rather do that than just "scuff and shoot". I have access to all 3 methods above so its a matter of what you think will work best?
>
> Thanks again...
>
> Steve
> --
> 75 26' GMC Glenbrook
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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