Acrylic techniques have used
COLLAGE TECH ("gluing" in French)
1 - You can paint before or after gluing on your canvas.
2 - Anyway the paint must be dry.
3 - Acrylics are easier for a base, because they allow you to glue your stuff
with water-based glue.
4 - Apply an even glue layer into the back of the chosen motif (from newspaper
to magazines, as long as it isn't plastic thou this can be done, it'll come off
sooner or later because doesn't stretch and
shrink with the canvas)
5 - Apply a thin glue layer into the spot of the canvas you're inserting your
motif.
6 - Apply your motif and with a brush damped in glue, brush it into place
smoothly.
7 - Let it dry and don't pay attention if it's a bit "curly" even if you brushed
it in all directions...
when it dries it'll shrink and be flat.
Note: glue must be transparent, the kind you use for wood, and thinned with
water, so it doesn't create lumps. Wood glue tends to leave a mate glaze. You
can take advantage of this for other type of work, like applying layers and
layers 'til you get a textured piece on your canvas. You can do this on top of a
part you already painted and want it more diffuse or on something you want to
glue but want to add volume. Anyway let layers dry before applying another or
it'll take forever to dry...

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BALLAYAGE TECH (that means "brooming" in French)
1 - After sanding with a very smooth sheet of sand paper your cotton canvas,
apply an even fluid
water based acrylic enamel coat (white).
2 - Let it dry, apply a thicker 2nd coat.
3 - Apply a small amount of paint (another color) from the can, and with a
rubber spatula about a palm wide (used for serigraphs) run smoothly through the
canvas starting to "draw your painting".
4 - Let it dry, apply as many colors and layers as you like until you achieve
the desired effect.
Note: You must let it dry between each layer.
As layers build up, traces of previous ones will show.

Next: Painting