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Surely they're sanding back to the wood in the areas where a bond hasn't been formed so that they can fibreglass to that?
Provide there is a strong bond to the wood and surrounding fibre glass logically it should be aok. The main issue that springs to mind is the aesthetics - if it's blended in properly over a wide enough area it should be OK. If its not then it'll look like it's got patches.
Also if they did a shit job first time are they qualified to do it? Our neighbours fibreglass roof looks really neat. Idk what it's like up close though I guess.
They are sanding right back to the wood underneath in places . Can't see how this could possibly be a proper solution
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