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Old 08-01-2013
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Re: Do I have to predrill before running screws into fiberglass

You will likely not be able to use the butyl along the length of the wood between the screws. I re-bedded the wood eyebrows on my cabin top last year and the screws are about 1.5' apart. Not enough force to compress the butyl properly. I used butyl around the screws and Sikaflex 291 under the wood.
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