Sanding foils

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#ed
Posts: 118
Joined: Tue Jan 15, 2013 4:00 pm
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Sun Jul 29, 2018 10:43 am

My hydrofoil wing has a few surface imperfections from crap sanding and hitting the beach (shingle).

I gather the procedure to remove these is to wet sand 400 / 600 / 1000 then rubbing compound on foil, then square off the trailing edges to 0.5 - <1.0mm but.....

What paint / compound is used prior to this and is the foil sanded prior to application?
#ed
Posts: 118
Joined: Tue Jan 15, 2013 4:00 pm
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Mon Aug 13, 2018 3:39 pm

For the record. I repaired any small voids with west systems 105 / 205 mixed with high density filler then sanded down 60/120/240/320 grit. Then scuffed up the whole foil with 320 grit. I then used a high build primer to paint. Low density filler would be better for sanding but some of my fills were on tips and needed some structure.

It was then sanded wet 400 / 800 / 1000 / 1500 then polished with rubbing farecla compounds with a pass each time of the trailing edges to keep between 0.5 and 1mm. Result is a foil with no whistling and really smooth ride from one that was making a slight noise and suffering from what I think was random flow fails.
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