Victorian terrace firewall fibreglass waterproofing paint, good or bad?

Question

I've a small leak into the loft from the firewall on a three-storey Victorian terrace house. All the firewalls and chimneys were re-rendered about eight years ago but on inspection there are quite a few fine cracks and in places some of the outer layer of the render has come away. 

I've had two quotes from roofers to hack off the render and replace. Both of them then recommend a fibreglass paint that lasts for 'ten years'. I've queried this (no answer as yet) and looked it up online but can find little information. In both instances the roofers insist the fibreglass paint waterproofing is integral. My father in law is a retired architect and says nothing like fibreglass should be used as the walls needs to breathe or flex (though this is a paint, I guess?). 

Any advice on this would be really helpful. Thank you.

Ryan · Answer

I have used fibreglass paint before to seal small holes and leaks and never found a problem with it. you can buy the cheaper versions of the fibreglass paint but I've personally found them to be a complete waste of time. good quality fibreglass paint will be recommended by any competent roofer.

Victorian terrace firewall fibreglass waterproofing paint, good or bad?

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