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Repairs to stress cracks 
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Joined: Mon Oct 01, 2007 7:25 pm
Posts: 956
Location: Near Milton Keynes
GTM: Cox/Coupe
Post Re: Repairs to stress cracks
NOT STRICTLY A REPAIR FILLER

I'm sure others have heard of this stuff :wink: , I use it very regular on all sorts of things including gluing two halves of F1 tubs together, Or in fact for the application in question.

Once it has set it can be rub'd down "BUT" make sure its not loaded on as its tuff old stuff to rub down :twisted:

The only problem is its quite expensive :cry:

http://www.meister-abrasives.ch/en/__da ... nglish.pdf

Oh and you can add pigments but I would look at painting over for best results :D

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Mon Jul 20, 2009 8:00 am
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Joined: Thu Nov 15, 2007 10:22 pm
Posts: 363
Location: Ireland
Post Re: Repairs to stress cracks
Dino,

The stuff that I have been using is ISOPON P40 fibreglass filler, it seems really good,


Tue Jul 21, 2009 7:55 am
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Joined: Wed Oct 03, 2007 8:54 pm
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Post Re: Repairs to stress cracks
:wink:


Tue Jul 21, 2009 11:43 am
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Ready for SVA

Joined: Thu Nov 15, 2007 10:22 pm
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Location: Ireland
Post Re: Repairs to stress cracks
Well I started to repair a couple of cracks on the bonnet, as I began to cut into the crack I found that 9 out of 10 times the crack was right over a air bubble in the gelcoat or first layer of fibre, has anyone found this before, I have also found a number of these bubbles appearing as I sand back the gelcoat ready for painting, not knowing much about fibregalss is this a common thing? :?

Anyhow here's a couple of pics of the job so far.

Image
Image
Image

I hope I'm doing it right :)


Fri Jul 24, 2009 8:23 pm
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Admin, and Coupe Nutter
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Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1738
Location: In the workshop
GTM: Cox/Coupe
Post Re: Repairs to stress cracks
Yep I found a few air bubbles behind the gel coat when I prepped mine, with the worse areas being on complex bends where the matt has not sat down 100% against the gel coat as you have found on the front splitter.

Also the areas where you grind out cracks always get 10 times bigger than you think they will be!

After building back up the shape be careful when sanding back as not to loose the shape or induce high or low spots, it takes time and it will be worth it as once its painted any imperfections are magnified, always use a rubbing down block and avoid fingers/palms of hands as much as possible, as you may induce faint grooves into the surface.

I always use a guide coat, for example some cellulose matt black. make sure it is compatible with your chosen final paint.

West

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Fri Jul 24, 2009 9:10 pm
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