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  Author    glassfibre tissue  (currently 309 views)
lester stenson
Posted on: December 25th, 2013, 22:40:16 Quote Report to Moderator
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my marcos isa mark 3 with a clear gelcoat, this has cracks and crazing all over it and looks a bit sorry for itself. I propose to cover the whole outer bodyshell in resing and glassfibre tissue to insure the the cracks don;t reappear how have some of you guys tackled this problem, as you can see from my previous threads i have to graft a new front on it so it is having major work anyway. Any idea's where to get the tissue from by the way.

cheers people and merry xmas
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admin
Posted on: December 25th, 2013, 22:56:28 Quote Report to Moderator
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You can get tissue from Halfords in smallish quantities, or from online fireglass suppliers, Scott-Bader (The Fibreglass Shop), some chandlers and boat yards.

If you're not going to remove all the gelcoat then I suggest that you at least grind out the cracks so that any dampness can evaporate and the resin can flow into them.
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John Dickens
Posted on: December 26th, 2013, 09:53:26 Quote Report to Moderator
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East Coast Fibreglass.

http://www.ecfibreglasssupplies.co.uk

I don't think a covering of tissue will stop the cracks reappearing in stress areas though.

These will need to be reinforced first.
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lester stenson
Posted on: December 28th, 2013, 00:56:00 Quote Report to Moderator
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so what's the best way of doing this cause i only want to do it once.

cheers lester
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mike brown
Posted on: December 28th, 2013, 08:52:54 Quote Report to Moderator
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Tissue is fine over small and minor cracks but major and high stress areas I would put some additional mat on the inside then you need to grind the outside deeper some chopstrand or maybe some woven put in then tissue and filler.
Mike
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John Dickens
Posted on: December 28th, 2013, 09:46:00 Quote Report to Moderator
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Stress cracks are caused by flexing so you need to reinforce the area to stop it flexing.

Abrade the GRP behind the crazing with something fairly aggressive. I use a twist knot wire brush in a angle grinder. Laminate on the csm until you are happy that it is rigid enough then repair the outer surface as described above. To be honest it's a total pain in the butt but unless you do it right then cracks will reappear very quickly once the car is in use again.
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admin
Posted on: December 28th, 2013, 11:39:43 Quote Report to Moderator
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I got a length of coarse sander belt about 10cm wide at one of the shows and that's good for abrading the fibreglass. I just cut off a short length at a time as required.
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