Digital BW, The Print

  ----- Original Message ----- 
  From: Paul Roark 
  To: DigitalB&WPrint 
  Sent: Thursday, November 14, 2002 12:07 PM
  Subject: [Digital BW] Coating -- 16x20s


  This morning I coated my first Eclipse 16x20 (17x22 paper) with a wire-wound
  rod and polyurethane.  The process appears to scale-up to this level without
  too much trouble.

  The main problem I had in setting up is that I have no totally-flat counter
  top.  (I use a plywood sheet over my darkroom wet-sink as a working space.)
  I ended up using two 22x28 picture-frame glass sheets on top of this plywood
  to try to smooth the surface.  I found that to get the surface flat I needed
  to put some pieces of paper between the two in certain areas.  I used a good
  straight-edge to be sure the surface was flat.  With that on the top glass,
  I tried to slip a piece of paper between the straight-edge and the glass.
  If I could, I knew I had a low spot where I needed to put some paper between
  the two pieces of glass.

  At any rate, having set up the counter yesterday, the process of coating the
  16x20 today was rather easy.  From taping down the top of the print to
  finishing clean-up took 10 minutes.

  The results are not 100% perfect yet.  Looking at reflected light off the
  surface of the print, the coating shows some signs of unevenness -- slight
  "banding" from the rod not being even against the print.  This is probably,
  in part, my counter top problem.  Also, I did not follow my 8x10 procedure
  in that I didn't have a couple of pieces of copy paper under the print.
  Some butcher paper might be the answer here -- and also help with clean-up.

  Paul
  http://www.PaulRoark.com




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[Non-text portions of this message have been removed]

-----Original Message-----
From: Paul Roark [mailto:paul.roark@...] 
Sent: Saturday, November 16, 2002 1:42 AM
To: DigitalB&WPrint
Subject: [Digital BW] Coating -- 16x20s
 
The last time I reported my progress on scaling up to a 16x20, I noted
that
I had some unevenness, perhaps due, in part, to my less-than-ideal
counter
top and working surface.

I have now upgraded to a 1/4" thick glass and a flatter counter top
(melamine-coated particle board -- still not perfectly flat but OK).
Additionally, I used a towel between the counter top and the glass.
Finally, I used two pieces of butcher paper between the glass and the
bottom
of the print.

I'm happy to report the 16x20 I just coated looks fine.  There is no
apparent unevenness.

So, the coating system definitely scales to 16x20.

Paul
http://www.PaulRoark.com



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[Non-text portions of this message have been removed]

-----Original Message-----
From: Peter Marquis-Kyle [mailto:petermk@...] 
Sent: Sunday, November 17, 2002 1:20 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Coating -- 16x20s
 
Shire,Stanley wrote:
> Paul:
> The flattest man-made product is MDF (medium density fiberboard.) 

Flatter than float glass? I'd be surprised if it were so.

Peter Marquis-Kyle



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Please follow these basic guidelines:
- Include your full name with your message.
- Include the address of your website, if you have one.
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"flames."
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[Non-text portions of this message have been removed]