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wet sanding question #93119
12/21/06 06:51 PM
12/21/06 06:51 PM
Joined: Aug 2003
Posts: 241
Largo, Florida
papayamon2 Offline OP
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papayamon2  Offline OP
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Hi everyone! In my continuing restoration project of an old Trac 14, I'm trying to get the hulls to shine once again. So far I've wet sanded them all w/ 600 grit paper to take out some flaws and clean them up, but I'm wondering how many more iterations of wet sanding are needed? Should I go 1000 then 2000, then buff? Or what? Can I go straight to the 2000 w/out the 1000?

Thanks, and my wife will be glad when this is finally done!

-- Have You Seen This? --
Re: wet sanding question [Re: papayamon2] #93120
12/21/06 07:03 PM
12/21/06 07:03 PM
Joined: Apr 2002
Posts: 695
Ft. Pierce, Fl. USA
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I go 400/600/1000/1500/"buff magic"(compound)with very good results.

Regards,
Bob

Re: wet sanding question [Re: Seeker] #93121
12/22/06 12:34 AM
12/22/06 12:34 AM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
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600 grit will buff fine. Anymore than 1000 is wasting your time.

Use an aggressive compound first then an Glazing compound to finish.


Have Fun
Re: wet sanding question [Re: catman] #93122
12/22/06 05:06 AM
12/22/06 05:06 AM
Joined: Feb 2005
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Essex, UK
Jalani Offline
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When I've repaired GRP in the past I've always gone 400/600/800/1200 and finished off with G6 cutting compound (fine). For dark colours you sometimes need to follow up with G10. Then buffed with a good quality wax. The results are invariably as good as new.

[Linked Image]

Attached Files
93995-yellowhammer.JPG (64 downloads)

John Alani
___________
Stealth F16s GBR527 and GBR538
Re: wet sanding question [Re: Jalani] #93123
12/22/06 05:59 AM
12/22/06 05:59 AM
Joined: May 2006
Posts: 954
Mumbles Y.C Wales U.K
Mark P Offline
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Mark P  Offline
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Mumbles Y.C Wales U.K
Yellow and black striped hulls, must have been bees wax <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />


MP*MULTIHULLS
Re: wet sanding question [Re: Jalani] #93124
12/22/06 06:54 AM
12/22/06 06:54 AM
Joined: Feb 2004
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Looking for a Job, I got credi...
scooby_simon Offline
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Quote
When I've repaired GRP in the past I've always gone 400/600/800/1200 and finished off with G6 cutting compound (fine). For dark colours you sometimes need to follow up with G10. Then buffed with a good quality wax. The results are invariably as good as new.

[Linked Image]


Hey, John, that looks like an old Condor !


F16 - GBR 553 - SOLD

I also talk sport here
Re: wet sanding question [Re: scooby_simon] #93125
12/22/06 07:56 AM
12/22/06 07:56 AM
Joined: Feb 2005
Posts: 1,382
Essex, UK
Jalani Offline
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Jalani  Offline
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Quote
Hey, John, that looks like an old Condor !


At the time (1978) it was quite a NEW Condor! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

So what was the giveaway? - The 'Condor 1978' sticker on the transom? <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

I think it was about 2-3 years old, we'd had a bit of an accident with it and ripped a big chunk out of the stbd hull bottom. The reason for the photo was that I was rather chuffed with the finished repair. Using Jake's 8'/ 5'/ 2' repair standard, it was about a 2" standard of repair! <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

Re: wet sanding question [Re: catman] #93126
12/22/06 08:36 AM
12/22/06 08:36 AM
Joined: Jun 2001
Posts: 12,303
South Carolina
Jake Offline
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Quote
600 grit will buff fine. Anymore than 1000 is wasting your time.

Use an aggressive compound first then an Glazing compound to finish.


I've had trouble getting a 600 grit finished followed buffing to sustain a shine longer than a month or so with the Team Seacats blue N20. I'm going to go up a level with the sanding and try buffing again.


Jake Kohl
Re: wet sanding question [Re: papayamon2] #93127
12/22/06 03:40 PM
12/22/06 03:40 PM
Joined: Dec 2006
Posts: 16
KenReid Offline
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KenReid  Offline
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Hi group,
I just polished up my new to me 94 Hobie 20 hulls to look like new. On one hull I first used 600,then 3M rubbing compound with a buffer(not orbital) and then I buffed with 3M marine fiberglass cleaner/wax.I used lambs wool pads. On the other hull I just went right to the cleaner/wax. I can not tell them apart.
Happy holidays
Ken

Re: wet sanding question [Re: KenReid] #93128
12/22/06 04:04 PM
12/22/06 04:04 PM
Joined: Aug 2003
Posts: 241
Largo, Florida
papayamon2 Offline OP
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papayamon2  Offline OP
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Largo, Florida
I thought all buffers were orbital (my lack of experience!) I do have a buffer, but it's orbital. Does that matter?

Re: wet sanding question [Re: papayamon2] #93129
12/22/06 05:29 PM
12/22/06 05:29 PM
Joined: Feb 2006
Posts: 3,348
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fin. Offline
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If it were not orbital, it would cut like a grinder so you're MUCH better off.

For future reference, the lighter the color the easier to clean and polish. So, if you have a choice. . .

Re: wet sanding question [Re: fin.] #93130
12/22/06 08:54 PM
12/22/06 08:54 PM
Joined: Aug 2003
Posts: 241
Largo, Florida
papayamon2 Offline OP
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Looks like I'm set, then--my hulls are white!

Re: wet sanding question [Re: papayamon2] #93131
12/22/06 08:59 PM
12/22/06 08:59 PM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
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Orbital won't do it. You need a polishing buffer. If you go out to buy one be careful you don't wind up with a grinder. They look similar.


Have Fun
Re: wet sanding question [Re: catman] #93132
12/22/06 10:05 PM
12/22/06 10:05 PM
Joined: Aug 2003
Posts: 241
Largo, Florida
papayamon2 Offline OP
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papayamon2  Offline OP
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Hmm, my buffer says on the label: 10" Polisher, but it's definitely orbital. ??? What sort of motion does the one you're talking about have?

Re: wet sanding question [Re: papayamon2] #93133
12/22/06 10:35 PM
12/22/06 10:35 PM
Joined: Jun 2001
Posts: 12,303
South Carolina
Jake Offline
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South Carolina
to do real polishing, like catman says, it should look like a side angle grinder but with a rubber head, pad, and wool cover. If you were to leave this one running over one place too long, it will do damage. Should look like this (I've never seen one with a random orbit)

[Linked Image]


A random orbiting buffer (the kind that you find in the automotive section at walmart that mostly vibrates) will do a good job applying wax, but it will not work with rubbing compounds very well at all.


Jake Kohl
Re: wet sanding question [Re: Jake] #93134
12/22/06 10:52 PM
12/22/06 10:52 PM
Joined: Aug 2003
Posts: 241
Largo, Florida
papayamon2 Offline OP
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Hey, who told YOU where I bought my polisher? <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

Re: wet sanding question [Re: papayamon2] #93135
12/23/06 09:12 AM
12/23/06 09:12 AM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
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I have a Dewalt 849 var. speed. Got it from a local auto paint supply, $100. Use a wool bonnet with the aggressive compound and a foam bonnet with the glazing compound.

Since your local, if you haven't already, you should go down to Fiberglass Coatings in St. Pete. They're on 19 just before 38th ave on left. They have everything you would ever need and are very helpful.


Have Fun
Re: wet sanding question [Re: catman] #93136
12/23/06 09:59 AM
12/23/06 09:59 AM
Joined: Apr 2002
Posts: 695
Ft. Pierce, Fl. USA
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The best pads for the polishers are one piece...they thread right on to the standard 5/8" shaft of the polisher (which all serious polishers share)...they don't have strap on bonnets or rubber backing pads...they are about $18.00-$20.00

Here is what the manufactures rep for "Buff Magic" wrote me...

Our Buff Magic is used extensively by many boat manufacturers for polishing sanded gelcoat for repairs during the production process. All gelcoat sprayed after the fact of being pulled from the mold is sanded, and orange peel is unavoidable, so if yours is slight, you are to be commended on your application skills. Buffing from 400 is not recommended, nor is it a common grit to start buffing from. Most manufacturers buff at a minimum of P600 or finer. And for large areas such as an entire hull, you will highly benefit from going finer, such as P800 or P1000. The time and effort in sanding to a finer grit will save buffing time tenfold compared to the extra time sanding. Using only 400 grit will leave too coarse of scratches requiring much more buffing time and effort, and also will require multiple applications to remove all of the scratches. Multiple applications in addition to being time consuming will degrade the gelcoat beyond what is necessary, and also generates a lot more "heat" which can shrink the gelcoat, and create irregularities, and can cause a "print through effect" of the fiberglass behind the gelcoat. Additionally it is much easier to produce gloss when buffing finer scratches such as P800 or P1000. Buff Magic will work effectively from P600 and finer, but for your application to large areas, P800 or P1000 is recommended.

Jason Brennan
OEM Account Representative

Re: wet sanding question [Re: Seeker] #93137
12/31/06 06:26 AM
12/31/06 06:26 AM
Joined: Aug 2003
Posts: 241
Largo, Florida
papayamon2 Offline OP
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papayamon2  Offline OP
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Largo, Florida
So I finally got around to spending half a day (!!) polishing my hulls. I ended up going 600/1000/1500 on the wet sanding and then polished with a 3M rubbing compound & wax restoration product. I tried polishing from 1000 but wasn't happy with the results, but the 1500 worked great. Very pleased, if I can just keep 'em looking like they do now. Which leads to my next question...

What is a good product to wipe on to keep and protect my hulls so they stay nice and, more importantly, so I don't have to spend another day of my life polishing?

Re: wet sanding question [Re: papayamon2] #93138
12/31/06 08:58 AM
12/31/06 08:58 AM
Joined: Jun 2001
Posts: 12,303
South Carolina
Jake Offline
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If the polishing job was effective, the shine will hold up well over time. If it wasn't terribly effective, the shine you are seeing is probably more the waxes, oils, and/or fillers that are in the rubbing compound. This is what I'm experiencing with the Team Seacats N20 and why the shine isn't holding up (since I stopped at 600 grit before buffing)

I've had really good results with NuFinish liquid wax - or any of the modern waxes that have UV inhibitors in them. My F18 gets at least two coats a year and it is holding up very well.


Jake Kohl
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