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A question of painting

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rothwell_neil says:

Emily has been brush painted dark blue over the original pale blue gell coat. I have some questions for anyone who has painted their boat.
Does the gell coat continue down to the water line? If I do attack it will it leave me with a clue as to the water line for new paint?
Is it best to sand back to the original gell coat (as this can be seen in areas of scrapes and rubbing)?
Is this best done with an orbital sander or are there other quicker/better ways?
As Emily is on the hard I can't see spray as being an option so will roller and then use foam brush as per Daddsie's instructions. Single primer and 2 top coats?
Any other clues or information that may help? If this is a long job may wait to next year and just do all the other jobs this spring.

Any info welcomed.
12:50PM, 1 March 2009 PDT (permalink)

busy home [deleted] says:

You wont lose the water line ,, A random orbit sander will do the job easily ,, start with 150 180 240 ,, two or more undercoats sanded with 240 in between, then wet sanded by hand 240 g wipe with white spirit,
Choose a windless dry but not too hot day, paint needs to flow out.
Ask Dadsey about brushing!
Polish with a car polisher, Its not a long job with the right tools ..
ages ago (permalink)

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Skykomish E29 says:

The Original gelcoat was only coloured above the waterline the underwater section was clear gelcoat.
There was an article in PBO a couple of years back covering the topic of doing a good paint job by hand on the boat .
But I agree with Ron Steve has done a great job on Rum Runner
ages ago (permalink)

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Daddsie says:

The paint is applied with a roller but laid off with the foam brush.
ages ago (permalink)

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rothwell_neil says:

Have a random orbit sander so guess that I will take it back to gell coat, reckon i can do this in a day?
ages ago (permalink)

busy home [deleted] says:

Yes if you have lots of pads (abrasive) do not burnish with worn out ones! Is it an electric or air sander ,, air is faster.
ages ago (permalink)

busy home [deleted] says:

Are yougoing to do her dark blue again ? pale blue is easier to get a good finish with. (you dont notice the imperfections so badly)
ages ago (permalink)

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rothwell_neil says:

Bosch 270 watt electric, this will be faster than air as I do not have a compressor! Will see what she looks like in pale blue as that is the original gell coat and hope to get back to this before painting. Lighter colour certainly an option as I am not a slave to the fact that dark blue was the colour when we got her. Local screwfix so will buy lots of disks, is it worth trying 60 grit to get the paint off? The paint looks to be very thin, easily chipped off and has been worn off by fenders so should be easy to remove. Always an optuion to sand back to gell coat then buff back to shine?
ages ago (permalink)

busy home [deleted] says:

60 g would be too coarse, You will make swirl marks which would be difficult to erase latter, 120g if the paint is thick .
I doubt you can get away without scratches that wont buff up.
and she was painted in the first place because of imperfections .
I polished Goskar with a buffer but she faded within weeks ,so i decided to go red. I like the pale blue like Aeolus is..
ages ago (permalink)

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rothwell_neil says:

Emily was originally pale blue, if the dings in the rubbing strake are anything to go by there may be some imperfections in the gell coat.
ages ago (permalink)

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Skykomish E29 says:

I think the paint option is going to be a compromise as I can't find a colour to match the original pale blue. International do "Bondi Blue" but that is deeper than the original, but the closest that i have seen for marine paint. You may be able to get a better match with an automotive paint like Ron used, but not sure if you will run into compatibility problems. I have to say that now that I have finished polishing Aeolus she has come up beautifully, but has a few "dings " in the gel coat that I can't seem to polish out, so i think that it will only be a matter of time before we face the paint option, fortunately the yard where we keep the boat is a Blakes authorised sprayshop and do some great paint jobs on the boats at the marina, but I hate to think of the cost....
ages ago (permalink)

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neptunesnephew says:

Nip down to your local International Paint stockists this weekend, as International are GIVING AWAY! a CD Rom on their products. It includes a video of a professional preparing and painting a GRP hull using Perfection 2-pot. Presumably the techniques shown (including roller and tipping off) apply to one pot paints as well.
ages ago (permalink)

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pjbharrison says:

I have a Bosch 270 orbital sander too. I used 120 grade paper this week on heavy paint. Did a good job fairly quickly. I used 60 grade on another boat a few years ago for a small area - BIG mistake. Left deep swirl marks as Ron pointed out. Finish off with 240.
ages ago (permalink)

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