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Old 18 February 2014, 10:35   #1
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Using a flap disk

AS I have stated in previous posts I am planning to flow coat the deck of the rib. It was suggested to use a flap disk to sand the deck rather than a orbital sander. Is there any knacks/ tips to using flap disks for this type of work.

TSM
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Old 18 February 2014, 10:44   #2
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Be very careful. A flap disk on a grinder goes through metal very quickly, it goes through fiberglass like it's not there.
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Old 18 February 2014, 10:53   #3
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they great but i also used those sanding discs with rubber backing plate on a small grinder good luck
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Old 18 February 2014, 10:58   #4
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Both workwell glass is stronger than you think
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Old 18 February 2014, 11:01   #5
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Old 18 February 2014, 11:10   #6
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I got two flap disks with 40 grit paper. Are these the right type and are two enough for a 5m rib?

TSM
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Old 18 February 2014, 11:14   #7
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I got two flap disks with 40 grit paper. Are these the right type and are two enough for a 5m rib?

TSM
Should be fine. Dusty as hell tho
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Old 18 February 2014, 11:17   #8
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AS I have stated in previous posts I am planning to flow coat the deck of the rib. It was suggested to use a flap disk to sand the deck rather than a orbital sander. Is there any knacks/ tips to using flap disks for this type of work.

TSM
Buy several grades and see which one works best for you.
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Old 18 February 2014, 11:22   #9
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Are you trying to remove the existing gelcoat, or just key the surface for the new coat?

If the former, then you're probably OK (though 40 grit sounds a little coarse to me.)

If the latter, I'd think about going to a flap wheel on a drill rather than a grinder and flap disk. The loose leaves on a wheel are not as aggressive.

Then again, I don't have a glass hull, so it isn't something I have experience in, either.

jky
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Old 18 February 2014, 11:56   #10
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I want a key for some fibreglass and a key for flow coat
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