copal

In Reply to: copal posted by catherine on 06/03/00 at 1:08 PM:


Catherine ,

Firstly I do not suggest you use Copal or Amber
oil mediums in your work . That said , you will
probably want to try them --- so here goes .

Copal is a resin , which can be run [ heated to
over 250 deg C - 480 deg.F ]and cooked into oil .
Linseed or Walnut .
Normally the copal oil medium is very fluid or
thin , and used as a medium to facilitate the
brushing or application of paint to the last stages
of your painting .

Use very little , brush tip , no need to thin if
it is fluid [ test first ] .
It is used only in the finishing coats of your
work . When it dries , it is insoluble in turps.
or mineral spirits .

If you use too much the surface of the painting
will repel the next coat of paint . Then you may
have to sand with ultra fine sandpaper or wipe
the surface with alcohol .
This will allow the next coat to hold.

Copal resin will yellow or brown with time [ see
Kurt Whelte - The Materials and Techniques of
Painting ] . There are many types of Copal Resin ,
it's a name for different resins from all over the
world.

Dammar is a resin that is soluble in turps and
mineral spirits , needs only standing in a bottle
in sun light to dissolve .No need to mix this in
a copal oil resin mix .

Stand oil is sometimes used as the oil to combine
with the copal , so it may already be there .
This you can test for yourself as various mixes .
Remember , the drying time is longer with stand oil
so you may make your copal oil resin even slower to
dry .

Where to get it -

See GarrettCopal on-line , or maybe StudioProducts
from Rob Howard .

Hope this helps ,
Kim


: Has anyone ever heard of using a copal and turp mix? or copal/ stand oil and turp?? Is copal like damar crystals? Where could I find it?
: thanks

 
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