[Public-List] (no subject)

[Glennb]

Hi Dwayne,

I've started using a small belt sander hooked up to a shop vac for  these types of jobs. not a perfect solution, but a lot easier on the arms and faster than scraping.  For  some reason a belt sander clumps up the dust and doesnt throw the fines around nearly as much as an orbital sander.  cuts through the material a whole lot better. 

The yards in our areas require full ground tarps to capture the dust.  One guy next to me last haul out wrapped his boat with plastic tent to control residue.  

Good luck
Glenn
Dolce 318

Sent from my iPad

On Apr 30, 2013, at 8:46 AM, Hans Thomas <hthomas at mbari.org> wrote:

> Be sure to check with your boatyard before doing a complete removal of bottom paint as described. Many of the yards in my area of the country (san francisco bay, svendsens boat yard) will not allow an owner to do this because of the hazmat issues. The job must be done by the yard.
> 
> regards -
> 
> Hans Thomas
> "la mer ne pardonne pas" - James Keelaghan, "Captain Torres"
> 
> 
> 
> ----- Original Message -----
> From: "David Van Denburgh" <denburgh at andrews.edu>
> To: public-list at lists.alberg30.org
> Sent: Tuesday, April 30, 2013 11:40:54 AM
> Subject: [Public-List] (no subject)
> 
> Dwayne,
> 
> It sounds like you have an ablative paint. Most ablatives tend to build up over time. If you're having widespread adhesion problems, and you have a thick buildup of paint, I'd say it's time to take it back down to well-adhered material and then add your topcoats.
> 
> Sanding ablative paints is nasty. I recommend a quality paint scraper - it works better and faster, creating less mess.  I scraped the old ablative off our Cape Dory 36 (down to the barrier coat) several years back before repainting with VC-17 (we're Lake Michigan sailors).
> 
> Good luck,
> 
> David
> 
> 
> 
> Message: 7
> Date: Tue, 30 Apr 2013 07:03:49 -0700 (PDT)
> From: Dwayne Back <sifuback at yahoo.com>
> To: Alberg 30 Public List -- open to all
>        <public-list at lists.alberg30.org>
> Subject: [Public-List] Painting below water line
> Message-ID:
>        <1367330629.58449.YahooMailNeo at web122205.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
> 
> I started to sand the bottom paint this year in preparation of a couple of new coats and noticed some areas that there was adhesion failure. ?I began scraping and found that there was a general adhesion failure. ?I have scraped about 1/2 the boat and find that ~10% scrapes all the way to the gel coat in various spots with the remainder being covered by what look like 1-2 coats of an unknown paint type that appears to?adhere?reasonably well. I purchased Micron CSC (fresh water boat), before I discovered adhesion failure, which is supposed to be?compatible?with a wide variety of paints. ?My questions are whether it is best to just sand and paint as is, or would it be better to sand all the way down to the gel coat and start fresh? ?Should I do anything extra to protect the exposed gel coat? ? If I sanded all the way to the gel coat could I do more damage than good? ?Thanks for the feedback.
> 
> Dwayne
> #94
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