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PostPosted: Wed Jul 28, 2010 6:43 pm 
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Posts: 610
Location: SE PA/ Chesapeak Bay
Hi,

I can only go by what the experts at Gudgeon told me ..... (thats why I believe you can never allow any hardner to contaminate the 105 Resin .... no matter how little)

Yes, I've seen studies both way as to how smooth is smooth .... but take a rudder/blade sanded to 600grit ... hang vertical and spray w/ a waterbottle .... watch the water drops ... do they bead???? Now try a rudder/blade sanded to 2000grit and polished ..... no beads .... the water just seems to disappear .... there's not enough friction between the water and the blade's surface to create the surface tension to form/create "beads". Now that's SMOOOOTH. Is it overkill???? Most likely .... but what else are you going to do on those rainy days that you can't sail .....

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PostPosted: Wed Mar 30, 2011 11:24 am 
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Genmar Star wrote:
Image
I use west 423 Graphite powder mixed into epoxy. After it dries I wet sand .
I did this also the first coat came out awesome so per the instructions I had I did a second coat when I came back the next day the epoxy had kicked to aggressive or something because now I have bumps all over the rudders. So my question is can I use a 5" orbital sander to sand them back down to be refinished? I never have in the past always by hand but sanding epoxy by hand would suck! Any ideas?

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Floyd
00 Tiger
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10 Mile Surfside, Texas
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PostPosted: Wed Mar 30, 2011 11:59 am 
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Location: Jersey Shore
Hand sanding epoxy shouldn't be an issue. If you're having problems, you probably either need to use a coarser grade of sandpaper, or the epoxy is gumming up in your paper because it's not fully hardened. Power sanders have the nasty habit of removing a lot more material than you had intended if you're not careful.

sm


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PostPosted: Wed Mar 30, 2011 1:00 pm 
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Man I was hoping you would say go for it. I found this skill sander that has a pressure sensor maybe it would keep me from sanding to much. http://www.lowes.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10151&catalogId=10051&cId=SEARCH&productId=3089977&cm_mmc=SCE_gps-_-gps-_-gps-_-Skil%205%20Random%20Orbit%20Sander%207492-01

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Floyd
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10 Mile Surfside, Texas
Join us on our Facebook group: Surfside Sailing


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PostPosted: Wed Mar 30, 2011 1:39 pm 
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Joined: Wed May 26, 2010 6:04 am
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Location: Tampa, Florida
My best outcome was after I moved the project inside the air-conditioned house. All attempts until then resulted in bumps that could not be rolled out. I did all of this in the Summer in Florida. Even inside I had some very small bumps, so I did not ever resolve the issue completely. They looked mucho better than the same efforts with the same expoy products outside. Here they are after the effort indoors, to compare to the earlier posted pics of the job done outside.

Image

I ended up taking the rudders done inside and knocking off the very small bumps with 800 grit, then used rattle can epoxy for final coat. Not the smoothest finish, but they look great and are protected, hard as steel, rudders.

I may make another attempt after I speak with expoxy expert shop here in Tampa.

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ScotsSailor
1986 Hobie 16


Last edited by ScotsSailor on Sun May 01, 2011 6:27 am, edited 1 time in total.

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PostPosted: Thu Mar 31, 2011 1:45 pm 
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Quote:
rattle can epoxy
Do you mean spray paint?

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Floyd
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10 Mile Surfside, Texas
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PostPosted: Fri Apr 01, 2011 12:12 am 
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:lol: They must have some sort of clear on them from the factory that the sun eats off over time exposing the fibers beneath. It could be a clear resin finish but I don't think so. :lol:

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Rechne zwei mal fünfzig und ziehe vom Zwischenergebnis sieben ab. Gib das Ergebnis als Wort an.


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PostPosted: Sat Apr 02, 2011 8:32 am 
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Location: Tampa, Florida
Floyd, yep, rattle can = spray can.

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1986 Hobie 16


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PostPosted: Mon Mar 03, 2014 9:24 am 
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Location: Indianapolis, IN
To those who have done this:
Do you know approximately how much epoxy you used? I have some spare West 105 and slow hardener out in the garage. The fibers on these rudders are pretty gnarly.

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PostPosted: Mon Mar 03, 2014 10:15 am 
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About 1 to 2 ounces per coat per side.

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PostPosted: Fri Mar 07, 2014 7:27 pm 
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So I refinished my epo's and now I finished the decals to top them off!!! They will look sweet on the lake!!
Image

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1981 Hobie 16 cat fever
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PostPosted: Wed Mar 19, 2014 3:37 pm 
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Location: Bellingham, Washington
Nice Decals!!


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