AlistairM
regular
Reged: 10/06/2004
Posts: 72
Loc: Wales (Cardiff)
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The varnish on my small dinghy has flaked away leaving bare wood. Do I simply varnish straight on and sand untill a decent finish is achieved, or is something required in preparation. The boat is completly covered with a tarpaulin but "natural moisture" still penetrates.
Also can some one please settle some confusion once and for all. Can epoxy be used to fill cracks and splits in the wood, or is this a definete no no.
Thanks
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Englander
regular
Reged: 07/09/2001
Posts: 14313
Loc: Barcelona/Bollyolics
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Take all the varnish off and start again. I would use epoxy to fill the cracks, but lots wouldnt. Might need something more flexible.
But really all that varnish needs to come off, the wood has bleached also, I think it's Mahogany, so will come up a lovely reddish colour, once all the varnish is off and it's sanded. The whole boat probaly needs re-varnishing, if the varnish is all that old.
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deisel
regular
Reged: 30/01/2008
Posts: 70
Loc: rye, sussex
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You Shouldent Really Rub Bare Plywood Down They Usally Add A Diluted Coat Of Varnish First, This Stops It Splintering,
You Can Use Epoxy For Filling If You Mix In A Filler ie Silica.
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AlistairM
regular
Reged: 10/06/2004
Posts: 72
Loc: Wales (Cardiff)
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Thanks for the info, I will sand off all the varnish and reapply. This is my first "project" boat so I am looking forward to getting into it.
I am one of those rare occurances of being young(ish) and interested in wooden restoration jobs instead of out and plastic tubs.
Anyway thanks again
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Pete_Cooper
regular
Reged: 16/01/2005
Posts: 1016
Loc: West of Scotland
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I recently stripped some varnish using a hot air stripper - much easier and quicker than sanding.
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Alcohol is a very necessary article... It makes life bearable to millions of people who could not endure their existence if they were quite sober.
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stephenh
regular
Reged: 06/01/2002
Posts: 825
Loc: London UK
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Alistair - the black marks are fungi - probably a 'blue stain-in-service' fungus . The fungus itself often blows the varnish, use oxalic acid to bleach it and sterilize the spores. And then revarnish.
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Npm
regular
Reged: 16/11/2005
Posts: 50
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Hi
It looks as though the varnish has been blown off by damp penetrating from the inside of the boat, possibly rain water gathering against the transom. I would certainly look to the inside as well, and consider the quality of your rain cover. Damp may be getting in under the drain plug fittings and rudder hanging, so make sure that the wood under them is well sealed and bed them properly in something appropriate before refitting them.
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AlistairM
regular
Reged: 10/06/2004
Posts: 72
Loc: Wales (Cardiff)
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Thanks for lots of good advice, this being my first wood project its alla bit of a learning curve.
I plan to cover the transom in Oxalic acid as indicated above then sand down and revarnish
What would be suitable for bedding the rudder pintle on??
Oh and take on board the cover issue too, I will look to enhance that also.
Thanks for the patience.
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castaway
regular
Reged: 31/12/2001
Posts: 1279
Loc: Solent
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I would use Nitromors to remove the varnish...makes it a very quick and easy job.
In case you havn't used it before, be cautious as it gets everywhere and of course use latex or similar gloves.
If its warm and the nitromors is tending to 'dry out' to quick, cover with cling film or ali foil to keep it 'working' longer.
Possibly with a dinghy sized job it might be worth applying with a mini roller.
Regds Nick
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http://uk.groups.yahoo.com/group/Halberdiers/
http://www.yotblog.com/castaway/1720/
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Woodlouse
regular
Reged: 07/01/2006
Posts: 727
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Hot air gun and a scraper to remove. Totally safe as long as you're careful not to burn the wood by staying in one spot too long. What sort of dinghy is it?
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