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RE: Newbie polyurethane mistake

Original poster: "Chris Boden" <cboden@xxxxxxxxxxxxxxxx>

Had the same problem with our first set of coils. Sun-baking won't do it. I
have a 6" form that is STILL tacky and a major dust/hair collector.

It was coated about 7 years ago.

Chris Böden
President
The Geek Group / Applied Intellect
www.thegeekgroup.org
Because the Geek shall inherit the Earth!

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Thursday, June 30, 2005 12:38
To: tesla@xxxxxxxxxx
Subject: Re: Newbie polyurethane mistake

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Tom,

Wet sanding with a fine grit works great.  Just be careful that you dont go
too deep and take the insulation off the wire..

Gerry R.

>Original poster: "Bart B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
>Hi Tom,
>
>I've done the same thing with a flat secondary once. I ended up peeling
>off the hardened layer (as quickly as manageable). The inside then dried
>but was very bumpy. I then sanded it down flat and recoated, this time
>letting it dry. I've found a light sanding between coats is important for
>a high quality finish (just like the directions say).
>
>I always wondered, however, if I would have let it get a lot of sunlight
>if maybe this would sun-bake the coil dry. Thought of this too late to
>ever try. May be worth a shot for you.
>
>Good luck,
>Bart
>
>Tesla list wrote:
>
>>Original poster: "Coyle, Thomas M." <tcoyle@xxxxxxxxxxxxxxx>
>>
>>Having never worked with polyurethane before, I made what I'm sure is a
>>super-newbie mistake, and I'm wondering if there's any way to rectify
>>it.
>>
>>I coated my secondary with about 7 coats of polyurethane (until I
>>couldn't feel the ridges of the turns). Unfortunately, I didn't let each
>>coat fully dry before putting the next one down. Now, the outside is
>>rock-solid, but if you press with a finger, the coating will buckle and
>>peel. The bottom layers are still gelatinous, while the top is solid.
>>It's been sitting for 6 weeks while I work on other things, and that
>>inside just won't dry (if I pick off some of the top, it's still moist
>>below). This would seem to be a great testament to how wonderful
>>polyurethane is at sealing out (or in) moisture.
>>
>>Is there any way to salvage this secondary? Can poly be baked to finish
>>curing? Will the gelatinous poly cause flashovers or some other
>>nastiness? Has anyone ever made this mistake before (say yes - it'll
>>make me feel better)?
>>
>>Thanks,
>>
>>Tom
>>
>>
>>
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