Hi Mark, Thanks for the suggestion. I like the idea in concept. I have some of this bridge stock left over so I will drill some holes, apply the clear coat and then apply the thinner chaser. Then after a week or so I'll cut the stock in half to see what kind of penetration there is. I have often used the Spurlock method for bridge pins, but I wanted to try the clear coat because I would prefer not to use the epoxy while driving the pins - an extra step I'd like to avoid. I haven't tried the Nossman/Fandrich style cap as I haven't built a power notcher so I don't need a "driving fluid". The caps I have used are a 4- or 5-ply laminated maple. Alan > From: Mark Cramer <Cramer at brandonu.ca> > Reply-To: "College and University Technicians <caut at ptg.org>" <caut at ptg.org> > Date: Tue, 21 Apr 2009 18:12:19 -0500 > To: "College and University Technicians <caut at ptg.org>" <caut at ptg.org> > Subject: Re: [CAUT] install bridge pins? > > David mentioned sanding the epoxy coating. I've never done this, nor left > anything on the surface Alan. > > After surplus is brushed into the notches, I rinse and clean the remainder > with lacquer thinner, and it soaks in like an oil finish. That's the surface > I was trying to describe... nothing between the wood and strings. > > As for the barrier to moisture, I'm obviously relying on the initial coating > to penetrate as deep as it can (for about 10 to 15 minutes), then chasing it > with the thinned coat, which really dissolves and evaporates quite quickly. > > Again, it's not a layer on top, I don't really want that, the saturation of > the wood itself is all I'm after. If you haven't tried this method, I hope > you will, and let me know what you think. > > Thanks, > Mark > > > > -----Original Message----- > From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Alan > McCoy > Sent: April 21, 2009 5:52 PM > To: College and University Technicians <caut at ptg.org> > Subject: Re: [CAUT] install bridge pins? > > Hi Folks, > > Last job I coated the new bridges and caps with System 3 Clear Coat, a > penetrating epoxy. Letting it flow into the holes as it would. Rationale > being to seal the bridges as much as possible. This was done after drilling > and notching. I put the pins in dry. First one I've done with Clear Coat. > You can watch as the epoxy penetrates. It does not penetrate maple as it > does spruce, needless to say. But it does penetrate some. The hope is that > it reinforces the surface fibers for strength as well as form a humidity > barrier for the bridge as a whole. The jury is still out about longevity. > The only thing I don't like about it is the glossy finish as I'd prefer less > shine. (Holes were drilled deeper and pins were not seated or filed. No > lubricant used.) > > Alan McCoy > > >> From: Mark Cramer <Cramer at brandonu.ca> >> Reply-To: "College and University Technicians <caut at ptg.org>" > <caut at ptg.org> >> Date: Tue, 21 Apr 2009 14:03:52 -0500 >> To: "College and University Technicians <caut at ptg.org>" <caut at ptg.org> >> Subject: Re: [CAUT] install bridge pins? >> >> Yeah, that's what I'm chewing on at the moment Jim. I'm drilling a new > cap, >> and have pretty much decided to drive the pins "dry" on this one, followed >> by a drop of CA at each pin. >> >> >> >> A year or so ago I did a test to see whether CA, or epoxy (via a heated >> bridge-pin) penetrated the bridge cap better. After drying, I pulled the >> pins then sliced through the holes on a table saw. For the life of me, I >> can't remember the winner!? >> >> >> >> I did this at the Banff shop, so maybe Bert can help out. I've really got > to >> look into those memory enhancing drinks! >> >> >> >> Any case, Ron Nossaman's suggestion was/is that only the surface matters, >> so the depth (both went several mm) issue would be a moot point. >> >> >> >> When a valid idea comes along, I think it's important to get some examples >> in place in a hurry, after all it takes a few years of seasonal cycling >> before any kind of responsible conclusions can be made. >> >> >> >> Mark >> >> >> >> >> >> _____ >> >> From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Jim >> Busby >> Sent: April 21, 2009 12:34 PM >> To: caut at ptg.org >> Subject: Re: [CAUT] install bridge pins? >> >> >> >> I don't know if this has been said or not, but the Nossaman method of >> drilling the pin deeper than normal and using a laminated cap is extremely >> effective in keeping the top of the hole firm (laminated). Using CA glue > and >> filling the hole may negate the advantage of the deeper hole by filling > it, >> allowing the bottom of the pin to touch bottom, which has some negative >> effects. >> >> >> >> Jim Busby >> >> >> > > > > >
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