Monday, October 24, 2016

Hull Paint Project, Part 6

Placida, FL

Here is the expert advice I got from Jamestown Distributors after they read my previous blog post and looked at the picture.

Looking at the picture, it appears that the paint ran and left brush marks. Causes are usually too thick a coating was applied and having thinner on the brush will cause the paint to run.
After sanding the paint down, be sure to clean the surface well using denatured alcohol on a rag, then wipe dry with a clean dry rag.

We suggest thinning the paint 5 - 10 percent, use a foam roller. Prior to rolling, run the clean roller over some tape with the sticky side up to remove any particles on the roller. It may look clean, but this really does make a difference. Roll on a THIN coat, if thinned properly it should lay down smooth without the need to tip. For the first coat you will need to do a light sanding before the second coat. If that works well with an even smooth finish then do the same method for the second coat. If you are still getting sags and runs you are not rolling it out thin enough.
 I still have doubts about it being too thick. I'm an engineer and I do things by the numbers.  THICK or THIN are not numerical,  ml/ft^2  or  ft^2/ml are numbers.  If I spread it twice as thin as last week, I have enough paint for 6 coats, but the quantity ordered was supposed to be enough for only 2 coats.  Nevertheless, next time I'll spread it as thin as I possibly can.

My personal theory about the mistake was using thinner on the tipping brush.  It was running thinner that created the problem.  We won't do that again.  I did it because a YouTube video on roll and tip, talked about thinner on the tipping brush.  Note that now I am advised to do almost no tipping at all.

Of course, everyone else in the boat yard, plus all friends and relatives all have their own advice to give; and (guess what) the various advisories don't agree with each other.  I can't allow it to be a project designed by committee.  But I'm going to call Greg and ask for his advice.

Our Status: On Sunday we finished the hard work of sanding off the paint.  We could have been ready to repaint the primer coat today, but the package with the new paint won't arrive until Wednesday.  We'll have to waste some time until the.

1 comment:

  1. Dick
    Rather than ask a lot of questions I'll just go through the process.

    With a DA sander use 100 to 120 grit to sand hull (light hand)

    1 For your 32' boat, 2 quarts of top coat should allow you 3 coats on the hull.

    2 Mix 16 oz top coat, 8 oz brushing converter (LET STAND 30 MIN) and at least 8 oz
    brushing reducer(should be slightly thicker than water)

    3 Wipe down boat with acetone and tack surface.

    4 Use 4" hard foam roller.

    5 Coat roller with paint and roll nearly dry in pan (repeat).

    6 Touch roller to paint and roll in pan only to spread paint on roller (not to dry).

    6 That should give you enough paint on roller to cover 12"to 18" sheer to boot.

    7 Paint should be even coat with bubbles.

    8 LIGHTLY tip vertically (you are breaking bubbles not spreading paint)
    Leaving the last 2 " of bubbles un-tipped. This will keep you from having a hard line.

    9 Roll the next 12 to 18" and tip.

    10 When you get to the stern stop and check to make sure you have enough paint to finish
    second side. If no mix more, if yes keep moving.

    11 Stop, repeat next morning.


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