M77 spray

[Tom Simes]

On Thu, 3 Feb 2005 18:10:14 -0500
"Tom Hinton" <tph1 at bellsouth.net> wrote:

> I have used urethane on cores and such but was a little concerned
> about using it on a turtledeck due to the shape and the need to clamp/
> tape/ weight down. . How much weight is needed to hold it down so that
> the expansion doesn't push the balsa off?

On cores I use weights, but on other stuff I've been successful just
using the blue painter's masking tape at regular intervals to hold the
sheeting in place while the polyurethane cured.  I haven't had the
polyurethane push the balsa off yet, but I am also careful to use the
minimum amount of glue (per the method in the previous link).  Since you
will likely be dampening the balsa anyway to form it, that extra
moisture will help kick off the polyurethane and speed the curing a bit
as well.

By the way, my wife got a dress steamer some time ago and that thing is
perfect for steaming balsa to sheet with it.  I use it more than she
does!

-- 
Tom

_____________________________________________________________________

       |  ,  |               Tom Simes
---------(@)---------        AMA 230068
        --|--                NSRCA 3830
          '                  nsrca at shinymetalass.com
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