Re: Covering glue and application

From: <RLBailey_at_care4free.net>
Date: Fri, 28 Aug 2009 11:59:42 +0100

The glue should add very little ( a few mg) to the weight. The spray head of the can might be gummed up; make sure there is none visible on the outside. Turn the can upside down and spray may clear the head.If no good, you may need to replace the can. Thinned glue will be gobbled up by light wood; it soaks glue up like a sponge!

I lay the frames on newspaper and spray from about 60-70 cm above. 3 passes of 1-2 sec over an F1D wing is enough. If the paper all round is slightly tacky, that is usually enough. Make sure the spray is nice and uniform otherwise don't start! Cover the wing as quickly as possible after spraying.

Hope that helps.

Bob

  ----- Original Message -----
  From: Tapio Linkosalo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Friday, August 28, 2009 11:34 AM
  Subject: [Indoor_Construction] Covering glue and application


    Until recently I used the simple method of spraying a could of glue into
  the air and pulling the frame through it. However recently my spraycan
  (M3 - 77) started to produce "threads" of glue, maybe the solvents are
  drying out, so I decided to start spreading the glue with a brush or
  cotton pin. So I bought some Xylene to dissolve the glue into a
  spreadable form.

  I somewhat wondered, how the flying surfaces of my two new models turned
  out to be so heavy, and really figured out the problem as my new prop
  blades accumulated way too much weight while covering. For instance ( I
  just subtracted) the glue on my two first F1D wings was around 75mg,
  while the two new ones ended up at 120mg weight gain. Argh. I had to add
  that much glue to make it feel "tacky". Obviously I'm using two much of
  the glue, but I suspect that the problem is that the well-diluted glue
  soaks into the balsa, and does not stay on top?

  How much weight gain due to glue is acceptable? Is spraying on still
  better method? Maybe, if the can does not spray properly, I should
  dilute the glue and use a paint spray brush to apply the glue?

  Thx,

  -Tapio-


  
Received on Fri Aug 28 2009 - 03:59:54 CEST