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Old 09-08-2006, 15:36   #16
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Well, folks, this weekend should be my last weekend of significant grinding fibreglass for a month or so. After this I get the (relative) pleasure of laying glass...whoohoo! Chopped strand first, then Bi-ax. And then, if I'm really lucky...flowcoat!
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Old 25-08-2006, 12:19   #17
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There's a guy next to me in the yard repairing severe osmosis on a nonsuch. He actually used a planar to level off the newely cured glass layers. Then he uses the grinder and at the end orbital plam sander.
Petar
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Old 09-09-2008, 14:19   #18
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What are the best discs to use on an angle grinder for fiberglass in polyester resin? I bought a 50 grit fiber disc to use, is it supposed to be that slow?

I actually got a plastic backing plate for it but I thought I was supposed to use a rubber one so it forms to the surface better. I couldn't find a rubber one, any truth or difference?
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Old 09-09-2008, 14:31   #19
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What are the best discs to use on an angle grinder for fiberglass in polyester resin? I bought a 50 grit fiber disc to use, is it supposed to be that slow?

I actually got a plastic backing plate for it but I thought I was supposed to use a rubber one so it forms to the surface better. I couldn't find a rubber one, any truth or difference?
3M Green Corps Production Cut with a soft pad works great. Available in 24 and 36 grit. 5 and 6 inch. Great for surface grinding.

I also have some 24 grit "flap discs" that works well grinding fiberglass on edge (not surface).
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Old 09-09-2008, 14:45   #20
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Folks, You really ought to investigate a Festool for grinding fiberglass. Normally, it is absolutely verboten to do so in our local boatyards unless the entire area is tented to eliminate dust from contaminating the environment, as well as other boats. I started grinding on my boat, and the manager hot-footed over to read me the riot act. Then he stopped and watched. Then he sent over all of his supervisors to watch. Then they smiled and told me to have a good day. The attached photo shows my friend, Jeff Allen, sanding overhead on the underwing, without mask, goggles or dust on his black teeshirt. 'nuff said.
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Old 09-09-2008, 14:55   #21
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Folks, You really ought to investigate a Festool for grinding fiberglass. Normally, it is absolutely verboten to do so in our local boatyards unless the entire area is tented to eliminate dust from contaminating the environment, as well as other boats. I started grinding on my boat, and the manager hot-footed over to read me the riot act. Then he stopped and watched. Then he sent over all of his supervisors to watch. Then they smiled and told me to have a good day. The attached photo shows my friend, Jeff Allen, sanding overhead on the underwing, without mask, goggles or dust on his black teeshirt. 'nuff said.

YES! their air powered integral dust collection R/O sanders are way cool. I dont have one, but as soon as my Porter-Cable dies an "accidental" death, I can justify it to the Admiral.

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Old 10-09-2008, 00:04   #22
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Send a message via Skype™ to Whimsical
Roy
How long will he be your best mate after giving him that job.

Rupes also make a similar tool with a forced rotation and boy can it remove material, fabulous

Mike
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Old 10-09-2008, 02:02   #23
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I grind fibreglass daily at my work. I never itch, aside from the times I don't adhere to the following rules :

1) NEVER TOUCH YOUR SKIN WHILST THE DUST IS ON IT. Blow off all dust with an air gun before you THINK of touching any exposed skin. This counts for clothing flopping around as well. If your wrists get glass on them while you're reaching up, or over, and then your sleeves slide back down that will do it.

2) LEARN TO TAKE COLD SHOWERS. Take a cold one, rinse yourself off, lather if you must, then you can warm it up and make yourself comfy.

3) AIM THE DUST CLOUD AWAY. Duh.


If you're really paranoid you should wear work gloves over long sleeved clothing and then duct tape around where the gloves meet your sleeves. Nothin gettin in that way. Don't forget proper respirators and eyewear.
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Old 10-09-2008, 13:21   #24
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What is the best eyewear for grinding? I keep getting dust into my regular safety goggles. The kind that go completely over your eyes but have little vent holes around it.
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Old 10-09-2008, 13:28   #25
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Nothing, absolutely nothing beats not getting the dust on you in the first place. If you are grinding glass regularly, you are taking a big risk for silicosis and other tasty workplace hazards. I still use a mask and goggles, but then, I have survived to be older and smarter and healthier than those who were "tougher". Get a Festool.
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Old 10-09-2008, 13:55   #26
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Don't let the word "military" put you off, 3M makes great protective garb and they can give you any information you need on the phone, direct:


Military Maintenance & Repair Worker Safety Solutions from 3M Occupational Health & Environmental Safety Division (OH&ESD)



SandingGrindingPaintingWelding


If you are involved with the reset of equipment that is coming back from service in Iraq and Afghanistan, then 3M Occupational Health & Environmental Safety Division (OH&ESD) offers a wide variety of safety products and services that can help protect your workers during this process.
Every maintenance facility needs the following types of safety products in their maintenance operation:

Filtering Facepiece Particulate Respirators
Half Facepiece and Full Facepiece Respirators
Powered and Supplied Air Purifying Respirators
Hearing, Head, Eye & Face Protection (Aearo Technologies branded products)
Speedglas™ Auto-Darkening Filters and Helmets
Speedglas™ with Adflo™ Eye, Face & Respiratory Protection
Sorbents
Health & Safety Services, Online Medical Evaluations

For your convenience, all of the above 3M OH&ESD safety products and services can be procured through several different channels including GSA, DLA, DoD EMALL plus local and national distribution.
To order 3M safety products and services applicable to your operations, or to schedule an appointment with a 3M sales representative, call 3M at 1-866-290-0744 (0700-1700 hrs. CDT). Or visit our website at www.3M.com/OccSafety/WorkerSafety.

Visit our website at 3M.com/OccSafety for industry news, information on additional products, or to subscribe to 3M newsletters.


For really good eye protection, you'll need something like a hood with filtered air, because keeping the dust out means blocking airflow, catch-22. But they make "protection" in all sorts of degrees and prices, and for some reason the big box hardware stores just don't carry much of it.
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Old 27-09-2008, 08:46   #27
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There are some great suggestions on restoring Gelcoat. Could i have some opinions on polishing awlgrip (flag blue) topsides using a polisher. Forgive me if this is a dumb question but can you use a 110V electric rotary polisher (e.g. Makita) run by the onboard generator while working on the topsides from the dinghy? (I recall on shipboard in the Navy that all powertools ran on compressed air but rotary polishers need a compressor with output of 8.5 to 15 CFM - something I don't have or want). Thanks.
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Old 27-09-2008, 09:17   #28
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While doing the bottom of Dutch there was a man in the yard stripping the bottom of a boat with spray, he told me the cost was around $9 a foot. It looked ever nice right down to gel.

John
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Old 27-09-2008, 10:11   #29
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Forgive me if this is a dumb question but can you use a 110V electric rotary polisher (e.g. Makita) run by the onboard generator while working on the topsides from the dinghy? (I recall on shipboard in the Navy that all powertools ran on compressed air but rotary polishers need a compressor with output of 8.5 to 15 CFM - something I don't have or want). Thanks.
You are right - it is a dumb question, and if enacted will probably lead to a darwin award. Thats why the navy used air tools (and they are a lot lighter to handle).

If you want to do it afloat, do it be hand or hire the larger compressor (but you then need a big genny to run it!)
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Old 28-09-2008, 02:58   #30
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Polishing Topsides and the Darwin Award

Thanks, Talbot

I KNEW it was a dumb question - sorry I asked (Perhaps I should also shoot my kids to remove them from the gene pool).
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