[Public-List] Hull Painting

Wed Feb 29 18:41:57 PST 2012

Hi Jonathan, 

Gordon's comments are right on. I would add, that 2 part sprayed will give you optimum finish and gloss over paint pads, and paint pads seem to work better for me than brush. I painted Dolce's topsides three years ago with two part poly and decks with one part. I found it impossible to avoid runs and brush marks on vertical surfaces with both types of paint, so spent a lot of time correcting and brushing out imperfections - which caused a lot of trouble as the poly urethane paints set quickly and dont like to be recoated when wet. The instructions called for two applications, plus primer. I sanded each application except the last, and waited to make sure the paint was absolutely cured properly before begining the next application. took a week overall to do the topsides. 

Any wind, temp extremes at mid day, or late afternoon humidity will adversely affect the application with both types of paint - so look for painting days with a solid - no change weather forecast, if possible. 

Generally I will do only two part when I repaint again, as the 2 part seems to be much harder, adheres better, retains higher gloss over time, etc... 

also i would recommend using primer everywhere you repaint. Adds to longevity - at least it has on my new paint on Dolce. 

final thought; the previous owner had Dolce's hull spray painted with Imron 5 or 6 years before I bought the boat. It has lasted now over 12 years and is still in excellent condition. I buff out and wax the hull 1X /year during haul out. this helps keep the paint looking good- even though it is finnaly starting to show its age in a few places. 

If you do paint over the gell coat, you are committing to repainting on a regular cycle - be it 3, 5 or 10 years, at some point, you will need to do it again... 
I have wondered over and over if finish sanding the existing gell coat and spraying a new gel coat surface would have been a better, more long lasting option... I think it would be about the same amount of work for a much longer lasting finish coat. 

Glenn B 
Dolce 

----- Original Message -----
From: "Gordon Laco" <mainstay at csolve.net> 
To: "Jonathan Adams" <laughing_gull at verizon.net>, "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org> 
Sent: Wednesday, February 29, 2012 5:20:41 PM 
Subject: Re: [Public-List] Hull Painting 

Hello Jonathan - 

I am sure there are others with more experience than myself, but here's what 
I learned doing mine. 

The general difference between one part and two part is this: 

- two part is generally harder and more scratch resistant than one part. 
- One part is generally more tolerant of bad prep work. 
- a job with two-part will generally look good longer 

Aside from adhesion issues, the undercoat will provide you with something to 
fill blemishes with so that they will disappear after you do your sanding. 

Back to the diff between one and two part.... Two part will generally cure 
faster than one part can dry. So theoretically you can do more coats faster 
with two part. 

================== 

I painted SURPRISE when I first bought her, changing her hull colour from 
white to dark blue. I hoped it would help me not miss TOUCH WOOD so much. 
I used one part International paint - it was good paint but I had trouble 
with low spring temperatures and later with bugs. I found that painting a 
glass yacht is a lot more difficult than painting a lapstrake wooden boat. I 
had her professionally painted with two part the next year. 

I can send you pictures off list if you like. 

Hope that helps 

Gord #426 SURPRISE 

On 29/02/12 7:45 PM, "Jonathan Adams" <laughing_gull at verizon.net> wrote: 

> I was planning on painting my hull this season, and am 
looking for a little 
> advice: 

1. - One part or two part? If I am going to go to all 
the 
> trouble to prep the hull, does it make sense to do two part  even thoughit 
> is harder to apply? 
2. - Do I need an undercoat. I am putting this 
> over 
the original gel coat, and the color will not be changing much. Don 
> Casey¹s 
book does not mention an undercoat. 
3. - Once prepped, and 
> assuming the weather is good, 
is this a three coats in three day affair, or in 
> practical terms is it longer than 
that? 

Any other advice? Appreciate any 
> comments. 

Jonathan 
197 
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