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Matt sachs 24-02-2012 11:47

Hull Painting
 
I'm sure this has been discussed many times, but here goes....

I'm planning to repaint my hull this spring when it warms up a bit. I will be sand blasting down to bare shiney steel until noon or one pm then paint until the blasted area is covered. Repeat the next day and so on until I'm done.

My question is about cleaning the steel after blasting,prior to painting, what product to prime with, the faring material , top coat? above and below the water line products? Basically how would you do it if this were your boat you planned to keep for a long time?

sy_gilana 24-02-2012 12:02

Re: Hull painting
 
My hull is Inorganic Zinc coated so I have never gone to sandblast. I would blow clean the hull, then 2 coats of Sigma 7416 Hi solids epoxy Aluminum primer, then two coats of their Epoxy Tar (BREA) then two coats of their TCN Tiecoat. That is the bottom we currently have on. Then we have up to 8 coats antifouling and huge anodes. Pictures on our web page in the 2006 section. Good luck!

Matt sachs 30-03-2012 12:45

Re: Hull Painting
 
After spending more time waiting on my air compressor to catch up than actually sand blasting, I went out and found a "real" air compressor. It needed some work. It was loaned to me if I repaired it. So I fixed it, and OMG 200CFM @ 125psi is freakin awesome. I need a bigger sand blaster now.
Just my luck, its going to rain this weekend.:banghead:

steamgoat 30-03-2012 13:41

Re: Hull Painting
 
Matt,have fun, its a shi**y job ! Do make sure nobody touches the bare steel before you prime it, hand sweat/grease will affect the paint bond. Bruce.

Matt sachs 30-03-2012 14:26

Re: Hull Painting
 
Thanks for that, I didnt know. Whats the best way to get the dust off before you paint? air hose?

justwaiting 30-03-2012 14:43

Re: Hull Painting
 
Quote:

Originally Posted by Matt sachs (Post 919932)
Thanks for that, I didnt know. Whats the best way to get the dust off before you paint? air hose?

Rub with a dry rag while using air hose, then wip down with a rag and thinners. At least that is what i did on my Roberts when i still had it, but others may have better suggestions.

boden36 30-03-2012 14:51

Re: Hull Painting
 
Just blow the dust off - don't touch it with anything. If you use a rag you risk leaving cloth fibres in your nice new profile.
You may find that half a day is a little long between blasting and painting, but it will depend on humidity.
What sort of grit are you using?

Regards,
Richard.

Matt sachs 30-03-2012 15:12

Re: Hull Painting
 
Silica free Black Diamond 60/80 grit.

minaret 30-03-2012 15:15

Re: Hull Painting
 
Make sure your air is carefully separated with at least two filters before very thoroughly blowing off. Any oily moisture you may blow out of the compressor tank will really ruin your day without proper filtering.

Matt sachs 31-03-2012 15:09

Re: Hull Painting
 
Thanks for all the advice. I currently have moisture separator in line. Do I need another? I really really don't want to screw this up!

bobconnie 31-03-2012 16:29

Re: Hull Painting
 
:whistling:Ive always used acitone as a wipe down before spraying anything on a striped hull! at least thats what I did the few times I had to on my Colvin! seemed to work for me wiped it and blew it off again! and sprayed what ever I was useing at the time ! theres so many other paints out there now that I would have to talk to some boat painters about what to us nowdays things have changed alot in the last 10 yrs since I sold her !! But steel is still steel I guess!! so I would ck with some of the pros on here like Minaret hes still in the boat repair and painting bizz Im sure hes up to date !!

Matt sachs 03-04-2012 14:01

Re: Hull Painting
 
I put in a second air / water seperator, and son-of-gun, I'm getting a little moisture in the second seperator. Once again, thanks Minaret for the sound advice.
What are your thoughts about a faring material to apply over the primer to fill in a few of the ugly areas?
Then whats your opinion about the next steps....(hows that for an open-ended question??) Thanks again.

minaret 03-04-2012 14:08

Re: Hull Painting
 
Quote:

Originally Posted by Matt sachs (Post 923030)
I put in a second air / water seperator, and son-of-gun, I'm getting a little moisture in the second seperator. Once again, thanks Minaret for the sound advice.
What are your thoughts about a faring material to apply over the primer to fill in a few of the ugly areas?
Then whats your opinion about the next steps....(hows that for an open-ended question??) Thanks again.


Yea I usually run 3, one one the compressor itself, one after at least 25' of line to allow for condensation, and one right before the final line. But I am often running 100'-200' of hose off a filtered manifold. All filters always have moisture, getting a really dry airstream requires daily tank draining and good separating/filtering.
What primer did you use?

Matt sachs 03-04-2012 15:25

Re: Hull Painting
 
Quote:

Originally Posted by minaret (Post 923033)
Yea I usually run 3, one one the compressor itself, one after at least 25' of line to allow for condensation, and one right before the final line. But I am often running 100'-200' of hose off a filtered manifold. All filters always have moisture, getting a really dry airstream requires daily tank draining and good separating/filtering.
What primer did you use?


PPG Amercoat 240. Thanks

minaret 03-04-2012 16:25

Re: Hull Painting
 
Use Amercoat 114A epoxy filler. Heres the PDS for your primer. http://ppgamercoatus.ppgpmc.com/prod...240_PDS_AI.pdf


Many people will use WEST with 407 for just about anything, this included.



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