[s-cars] Sunroof switch cover-repair

[John Cody Forbes]

I like what JC is saying, and I'll just add that I like to heavily score the surface in this type of situation. The more surface area the glue has to bond to the better. Also these adhesives are much stronger in shear than tension, so deep scoring gives some small but important surfaces 90 degrees to the direction of the force trying to pull the clip off. I use my pocket knife or the corner of a very sharp chisel FWIW.

-Cody (mobile)

On Sep 8, 2010, at 10:53 PM, "JC" <jc at j2c3.com> wrote:

> +1 to Erics idea here. I think that's a good call - somekind of foo-acrylate
> to bond the pieces, but then add something with more mass behind it for
> structural reinforcement.
> 
> FYI I get some good tricks with polymeric PU (aka gorilla glue) playing with
> adding a tiny amount of moisture to get it to blow (aka foam) into various
> densities.  I might try that in this case - a tiny drop of water mixed into
> a little Gorilla Glue, then pour/squeeze that behind the area to be
> re-inforced. use a little masking tape to mold it and keep it from going
> where you don't want it to. still might have to trim it back if it blows
> into a big glob. If you try this be careful with the water though, it will
> blow like a mo-fo and expand all over the place if you're not careful. It
> would be a toss up for me doing that vs. similar trick with epoxy (except of
> course not adding water to epoxy - instead I'd blend in a fair amount of
> good bonding filler, like West Systems 403 or 404)
> 
> Last tip is that if you've been trying lots of different glues, you likely
> have contaminated the surfaces making each successive try less likely to
> succeed... I'd also lightly sand the surface back with a solvent wipe-down
> before and after sanding - probably acetone as long as whatever that plastic
> is can take it... ("test compatibility before using" as they always say on
> the package)
> 
>> I used JB Weld.  It lasted a few months.  This time (about a
>> month ago) I first put it together with cyanoacrylate glue,
>> and once that dried I covered the whole thing in a huge blob
>> of JB Weld.  Hopefully this will last.
>> 
> 
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> John J. Cunningham
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