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11th August 2013, 08:00 PM #1Novice
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- Oct 2012
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- Rural WA
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- 13
hairline cracks in surface of ply?
Hi,
In striping back the paint on my Mirror dinghy I have found some hairline cracks in the surface layer of the ply. As you can see in the photo (scraper for scale) it is evident on the bare ply where cracks are stained by the previous owners recent green paint (so guess he didnt even prime the bare bits ), and also some hairline cracks in the otherwise very solid and hard to remove (original?) white paint.
2013-08-11 16.00.01.jpg
Do I need to do anything about these or just paint over them? On one hand I am thinking that my simple repaint job has now turned into a 'replace all the outside tape and remove and renew all previous patch ups' job, I might as well strip every last inch of paint even the really solid stuff (going to be hard work, the paint that I have gotten down to is very well stuck on) and epoxy the whole outside, but another part of me thinks that is not necessary as the paint that is left is very solid, so just properly repair, sand, prime, and undercoat it all and let the new paint take up any minor flexing from these hairline cracks.
Thoughts?
Thanks
Anthony
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11th August 2013, 08:16 PM #2Senior Member
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- Jun 2011
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- Melbourne
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- 107
Honestly, it looks fairly sound to me. I'd scrape back to good paint (A heat gun helps), then fill, sand, prime and paint over it all.
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11th August 2013, 08:27 PM #3Novice
- Join Date
- Oct 2012
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- Rural WA
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- 13
Yes I have been using a heat gun to get as far as this but what paint is left takes some serious heat and scraping to get off hence my reluctance to try to get it all. The wood is generally very dry and sound so if those hairline cracks are not a concern that need a specific treatment, then I am happy to sand and paint over.
Thanks
Anthony
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11th August 2013, 09:11 PM #4
You don't have to remove solid paint nor sand back to raw wood, to rejuvenate the surface coatings. Generally, you sand back to well attached previous coatings, feather the edges, use some filler to fix blemishes, prime the bare wood and filler areas and recoat with your choice of paint. You don't need to make a career out of refinishing this old puppy. Make repairs where needed, fix dings, nicks and divots as required, feather any uneven areas and move on. Since you don't know what the previous paints might be, you'd be best advised to scuff the whole surface and prime to whole boat. This will lock down any compatibility issues and your new paint job will start with a good "tie" coat and a uniform color to build on.
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