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tcevans
Joined: 16 Jul 2002 Posts: 78
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Posted: Thu May 20, 2021 9:13 pm Post subject: Fin fairing compound |
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Want to smooth out minor nicks & scratches in MFC RTM waves fins
Looking for recommendation on a fairing compound:
- auto body filler (bondo)
- auto body scratch filler
- epoxy filled w/ micro balloons
- others?
Thanks in advance! |
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isobars
Joined: 12 Dec 1999 Posts: 20935
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Posted: Thu May 20, 2021 11:41 pm Post subject: |
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I just coarse-sand away the nicks and scratches, trying by eye and feel to stick to the original planform and edge. I then use ever-finer wet-sand paper until I can feel absolutely no irregularities. Takes just minutes in the kitchen sink, and I haven't lost one international competition yet doing that. |
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swchandler
Joined: 08 Nov 1993 Posts: 10588
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Posted: Fri May 21, 2021 1:27 am Post subject: |
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I have used Marine Tex in the past with good results. It's pretty tough stuff, but not always the easiest to use. Also, being white in color, its not going to be an invisible repair.
1/21 - If the MFC fin is made from injected plastic, it's my bad for my earlier comments. I was thinking G10 or similar laminated fins.
Last edited by swchandler on Fri May 21, 2021 7:00 pm; edited 1 time in total |
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grantmac017
Joined: 04 Aug 2016 Posts: 946
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Posted: Fri May 21, 2021 10:59 am Post subject: |
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Nothing really sticks to RTM in my experience. Better to just sand it back. |
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isobars
Joined: 12 Dec 1999 Posts: 20935
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Posted: Fri May 21, 2021 4:11 pm Post subject: |
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I should add that, if nicks on the edges are deep enough that sanding them smooth alters the outline/planform of the fin enough to feel it with a finger or fingernail, I just blend the nick in above and below it until it's no longer detectable except maybe with a straightedge. Since a wave fin has no straight edges anyway, what's another millimeter of curvature? If the board still turns and points like before and doesn't spin out, and you haven't been featured on a windsurfing magazine cover, WTH?
A bonus: the fin usually looks new again, rather than like a patchwork repair job on its last legs. |
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ctuna
Joined: 27 Jun 1995 Posts: 1125 Location: Santa Cruz Ca
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Posted: Fri May 21, 2021 7:17 pm Post subject: |
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Put the fin in a bench press gently(use a soft material so no direct contact
with the bench press) such that the divet is at the lowest
point then put epoxy on it to build up a drop of epoxy to cover the divet.
Let it dry then sand it to shape, being careful to get it equal sanding on both sides.
Also you can use tape around the divet after applying the epoxy to kind of shape it
so it requires less sanding afterward. |
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kevwe09
Joined: 14 Aug 2016 Posts: 1
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ctuna
Joined: 27 Jun 1995 Posts: 1125 Location: Santa Cruz Ca
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Posted: Fri Jun 04, 2021 10:54 am Post subject: kevwe09 all of your posts have been reported |
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kevwe09 all of your posts have been reported
Go sell you stuff on some other site |
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JamesHardy
Joined: 29 Mar 2002 Posts: 159
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Posted: Fri Jun 04, 2021 11:44 am Post subject: |
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I have use Solarrez epoxy ding repair to fix my RTM fins. Some of the dings have been upwards of 1/4 inch deep. It has chopped fiber reinforcement mixed into the epoxy for strength. Easy to work with and sand.
https://www.solarez.com/product/epoxy/ |
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wndsrfrmn
Joined: 30 Jun 2001 Posts: 36
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Posted: Fri Jun 04, 2021 11:48 pm Post subject: |
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I always grab a rock off the beach. A course rock will even out the big dings then grab a tumbled river rock to smooth things out. |
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