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Go Back   SailNet Community > On Board > Gear & Maintenance > Is this a Good Sander for Bottom stripping
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Thread: Is this a Good Sander for Bottom stripping Reply to Thread
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Topic Review (Newest First)
04-27-2012 10:36 PM
SloopJonB
Re: Is this a Good Sander for Bottom stripping

Quote:
Originally Posted by follysurf View Post
Alright, I am going to try this drywall scraper but feel that I will need the orbital at points of the process and it probably also a good tool to use between coats. ( have not read instructions on paint but assume you still need to sand betweeen coats).

So back to the original question. Does orbits per minute or operating amps matter more. The Dewalt seems to be the most comfortable but has a far less opm with greater amps. Other Dewalts, Bosch,Porter etc are about 3 amps with 7000 to 12000 opm. the other Dewalt is 6 amps with 3600 opm.

Thanks for all the responses and opinions. Never even thought a drywall screen is the best choice!
Amps = horsepower and as every car guy knows, you can NEVER have too much horsepower. Go with the DeWalt.

I'd use a longboard like the one I posted a picture of, or maybe one of the drywall screen sanders for between coats - it will fair things up and you only want to trim off the high spots in that situation - you don't need "tooth" for the next coat of bottom paint.
04-27-2012 02:53 PM
ehmanta
Re: Is this a Good Sander for Bottom stripping

The fewer the rpm's the less likely it will gum up because it won't built up as much heat which is a good thing when sanding paint. The higher rpm's is great for getting a smoother finish on wood without apparent sanding scratches. For bottom paint, this doesn't matter. I use a 7" right angle sander/grinder with 50 grit disks for removing bottom paint in a hurry but it will leave a tremendous amount of sanding marks/swirls. Caution: the big sanders like this will throw dust all over you and the environment
04-27-2012 02:08 PM
follysurf
Re: Is this a Good Sander for Bottom stripping

Alright, I am going to try this drywall scraper but feel that I will need the orbital at points of the process and it probably also a good tool to use between coats. ( have not read instructions on paint but assume you still need to sand betweeen coats).

So back to the original question. Does orbits per minute or operating amps matter more. The Dewalt seems to be the most comfortable but has a far less opm with greater amps. Other Dewalts, Bosch,Porter etc are about 3 amps with 7000 to 12000 opm. the other Dewalt is 6 amps with 3600 opm.

Thanks for all the responses and opinions. Never even thought a drywall screen is the best choice!
04-27-2012 01:27 PM
ehmanta
Re: Is this a Good Sander for Bottom stripping

Having done this job a time or two, I can tell you that there's a couple of variables involved.
One, do you know what the previous layers of paint are? Hard or ablative. If it is hard paint, the work load just doubled or even tripled if it is Trinidad (stuffs just plain hard).
Two, how many layers?
Three, what kind of environmental laws are in your state? Some states it is illegal to sand without vacuum systems, some states it is illegal to do it yourself.....a professional/licensed boat yard is required.

Since you boat is fairly small, it shouldn't take too terribly long, but you may find that a sharp scraper will cut through it like butter, until it dulls then you need to sharpen or change blades. Here's a good one:
Sandvik / Bahco Double-handed 655 Ergo Scrapers

Finish off with a random orbital, I don't think you can go wrong with the big names like DeWalt, Porter Cable, Milwaukee, Bosch, but sty away from cheap ones like Ryobi and Harbor Frieght, they'll have a significantly shorter life. Make sure they are comfortable to hold inverted, sideways, backwards while applying pressure. Variable speed is also very helpful...helps from burning the paint and gumming the pad.
04-27-2012 11:49 AM
travlineasy
Re: Is this a Good Sander for Bottom stripping

The head I saw used was metal, but it looked almost identical to the one pictured above.

Cheers,

Gary
04-26-2012 05:29 PM
jeffphoto
Re: Is this a Good Sander for Bottom stripping

Depending on the state of the bottom, a two handed scraper may be needed first. Then I like the Ridgid (Home Depot about $130) 6" hook & loop 6 hole R.O. hooked up to a shop vac. Disks harder to get than 5", but much faster. Use 60 or 40 grit, depending. Amazone a good source.
04-26-2012 05:25 PM
msmith10
Re: Is this a Good Sander for Bottom stripping

I just sanded my C&C 30 a week ago. I've done it with an orbital, a belt, a disc, you name it, and I'll never do that again-- too much work and too much mess. This time I wet sanded with a swiveling drywall sander (as shown above) on a pole with 100 grit screen. I hosed the bottom down then sanded. Every couple square feet I stopped, hosed off the "mush" and the sander and restarted. It was the easiest sanding job I've ever done. The boat is painted with Micron Extra, a soft ablative and I've always disliked the fact that even with a sponge roller or roll + tip, you can't get a smooth finish. I sanded it to smooth off the "wrinkles" in the old paint and to remove some of the buildup. The result was great- as smooth a finish as VC17. There was no dust and I did the whole boat in about 5-6 hours.
I did have to replace the sander- my first one was plastic and the piece that swivels broke. The next one I bought was all metal and worked well. I used about 8-10 screens for the whole project.
Contrary to one of the posts above, I found it easier for the most part to sand lengthwise- just physically easier. In a few areas sanding vertically was better but mostly for-and-aft. You can tell when it's time to stop and rinse everything-- a layer of mush builds up.
I don't know how it would work on a hard paint, but on an ablative, it's great.
04-26-2012 05:11 PM
SloopJonB
Re: Is this a Good Sander for Bottom stripping

Quote:
Originally Posted by mmazour View Post
This would be the drywall sander Travlineasy er Gary is referring to I believe.
Molded Plastic Pole Sander
Thanks for that. It looks the same as the one I used except for the swiveling head feature. I guess I should try screens from a different manufacturer since others seem to have had good results with it, even though I didn't. I also didn't know about the water dip aspect - that might make all the difference.
04-26-2012 05:06 PM
mmazour
Re: Is this a Good Sander for Bottom stripping

This would be the drywall sander Travlineasy er Gary is referring to I believe.
Molded Plastic Pole Sander
04-26-2012 04:38 PM
H2814D
Re: Is this a Good Sander for Bottom stripping

Haaa...Are you completely unsure of what to use now? Are you glad you asked? :-)
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