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Old 18 February 2014, 12:27   #11
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i did the whole bottom of my boat with 40 grit on a 6" RO air sander. Gelcoat is tough, the 40 grit worked great. Anything less wouldn't cut the gelcoat. The second and third time I sanded the bottom I used finer grits on a regular 4" electric RO before epoxy and paint.

Jason
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Old 18 February 2014, 15:58   #12
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I use a flap disk like the blue one posted above on metal all the time. There is no way I would take it to fiberglass and expect it to be flat when done. They just don't have enough surface area to keep the material flat.

I would on the other hand use my DA sander, and keep it moving to keep a flatter surface. The sanding surface area is 6".
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Old 18 February 2014, 16:52   #13
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Try keep grinder as level as you can!!! No sharp steep angles as edge will cut in and gouge. Used to build Ali boats and you can dress surfaces neatly if you use sweeping motion letting the grinder do the work ! Don't force it
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Old 19 February 2014, 04:54   #14
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Used the grinder and flap dick last night. It works very efficently. As stated keep it flat. In one spot I let it stand for a tad long and it did dig a localised hollow. Not hard to repair.
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Old 19 February 2014, 06:05   #15
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Originally Posted by two stroke mick View Post
Used the grinder and flap dick last night. It works very efficently. As stated keep it flat. In one spot I let it stand for a tad long and it did dig a localised hollow.
Somebody stop me, please..............:P
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Old 19 February 2014, 06:35   #16
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Somebody stop me, please..............:P
Maybe itís not a typo???
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Old 19 February 2014, 07:12   #17
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Go on PD I dare yer
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Old 19 February 2014, 08:08   #18
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Very good. I will let the smart ones figure out if it was a type or if I was typing my actual experances

TSM
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