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Re: Wipe on poly

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  • badgerberling
    Very interesting Corky. I m about to close the football on a Prospector made for a charity and will archive this email for reference. RB
    Message 1 of 12 , Jun 17, 2013
      Very interesting Corky. I'm about to close the football on a Prospector made for a charity and will archive this email for reference.


      --- In cedarstripcanoes@yahoogroups.com, Charles Scott <charles.k.scott@...> wrote:
      > I've applied polyurethane spar varnish to my several cedar strip
      > canoes a number of times. Mostly I was so unhappy with my results
      > that I'd end up letting it cure and then sand it down and try again.
      > I tried a number of urethane brands and for the most part, all of them
      > ran and dripped equally well.
      > I just sold the Winisk to a couple down in Florida and felt I had to
      > renew the finish as it has been sitting in the rafters of my car port
      > for three years. But I dreaded trying yet again while the temps up
      > here in Vermont are not real warm yet. So in desperation I decided to
      > try the wiping on method.
      > I researched it on the Internet and this is what I learned: Cut the
      > urethane by 50% using mineral spirits or whatever the designated
      > thinner is, then wipe it on using a clean folded cotton rag.
      > I did not begin until I had sanded the hull down using an orbital
      > sander and 220 grit sandpaper attached to my shop vac. This took care
      > of all the blemishes and drips that bothered me so but that I finally
      > tolerated in order to get it on the water three years ago. Then I
      > wiped off the hull using clean rags and finally wiped it down with a
      > rag damped with mineral spirits.
      > I thinned the urethane as suggested, using a graduated quart size
      > pail, leaving most of the urethane in the can, and started wiping it
      > on. After one coat I was hugely unimpressed. It looked like I had
      > done nothing. But one of the benefits with the wipe on method is that
      > it covers a lot, quickly, and another that it also dries very quickly.
      > So in a couple of hours I got to apply another coat.
      > Things looked marginally better than the first coat, but it was
      > obvious that it was going to take a LOT of coats using this method.
      > Before applying another coat, I hand sanded the hull to remove
      > embedded lint. Seeing where I needed to continue to apply the
      > urethane became an issue with the fourth coat.
      > Once that coat dried it now became obvious that this method was going
      > to be phenomenally smooth compared to everything I've tried
      > previously. Absolutely no drips or runs. The only negative was that
      > each coat was microscopically thin, which meant I had to apply many
      > more coats than I ever had before. Also, each rag had to be discarded
      > once the day was done. I didn't want to attempt to preserve the used
      > rags, I had a large supply.
      > So I'm pretty pleased now, it looks like two or three more wiped on
      > coats and the new owners should be really happy with it and I will
      > have done my best to earn the selling price.
      > Corky Scott
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