Re: Covering glue and application

From: slo_mi <slomi_at_EUnet.yu>
Date: Fri, 28 Aug 2009 20:28:13 -0000

To my experience the best way for gluing very thin covering film on balsa wood frame is with a fine brush, with very thinned contact glue(glue:thinner = 1:10 or 1:20), when the frame lie on the covering film. As a glue I use rubber glue on the base of polychloropren, and the solvent or thinner is trichlorethilen. I go first with some point of glue outside frame at each rib, after that I go continual along spars,tips, and ribs. The yield of glue in the weight if wing is minimal, maybe up to 10 mg, but the quality of gluing is perfect.


--- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo@...> wrote:
>
> 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 - 13:29:23 CEST