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Old 14 December 2013, 18:48   #11
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Country: UK - England
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Judging from your 3rd picture (on right) you have a lot of gel coat damage, stress cracking. Those fine lines and star cracks will just re-appear through any paint that you apply. You might also find that moisture has penetrated into the structure beneath the surface in these areas.
To carry out a proper repair the old gel coat needs to be removed in those areas, any damage to the CSM needs to be rectified or strengthened and Flow coat applied to build up the surface again.
If you are going to paint or flow coat the whole hull I would sand the surface rather than using cleaner. To flow coat you would need to sand down anyway to give a surface for the flow coat to grip to so you might as well get stuck in now and get the 80's grit out! Don't be tempted to use car body filler to repair hull damage, it will just not last.
If you look at my Searider 5.4 project thread you will get the idea of the work that is often required.
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Old 15 December 2013, 01:58   #12
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Whats you plans for the rowing boat after its shiny and white? Gonna take a LOT to convince me that what concrete describes is anywhere close to worth the effort... ...any plans to row it across the atlantic?
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Old 15 December 2013, 11:15   #13
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Hi - we're Sea Scouts so we use the boat quite regularly actually

What you see in the 3rd photo is not star cracks - actually just growths on the surface.

I'll get it clean then take better photos of any chips.

We don't need to paint if it's a lot of effort. Getting it clean is the priority.
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Old 15 December 2013, 11:32   #14
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After reading about fairy power spray i bought some today, excellent stiff, shifted deep salt on my screen, green crap from rear and worked on grp and seats antreat. Well recomended.
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Old 15 December 2013, 13:35   #15
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Will try the fairy power pray and compare it to the cheap tesco bathroom cleaner and let you know results.

Will go for Oxalic acid + washing up liquid solution to clear the remaining stains.
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Old 16 December 2013, 18:03   #16
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Country: France
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Mix the oxalis with wallpaper paste to get a porridge consistency that will stick to the hull. Paint it on and wash off after about 10 minutes with fresh water. Only good for stains though.
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