The preparation is done in two stages: sizing and coating.
-L SIZING.
The oil painting is corrosive, it is essential to prepare the media. Whatever it is, to improve the adhesion of paint layers. The traditional sizing for oil is:
based skin glue, or isinglass. Sizing with casein s'utilse cold, and has the advantage of good moisture resistance, but remains fragile.
-THE CEMENT SKIN:
There are several varieties, the rabbit is the best for oil because of its flexibility.
But, easier to use, sizing based on synthetic resins, are quite suitable and they have good compatibility with various media
OTHER POSSIBLE PRIMER:
- vinyl resin (CAPAROL)
It comes in the appearance of a milky white liquid, which becomes transparent when dry. It allows funds and solid impervious, compatible for both the oil to acrylic, not colored, it can be tinted with dry pigments. It can glue a piece of paper or cardboard, a raw canvas, or strengthen already primed canvas.
In all cases it must be diluted with water.
(From this binder it is quite possible to produce colors using powdered pigments, then we obtain color vinyl).
As a precaution we will add to Caparol few drops of a preservative, this binder can sometimes present problems of storage - (a few drops of vinegar white) - or any other Conservative trade as an anti-fungicide.
-THE COATING.
coatings can be fat, skinny, mixed, traditional or synthetic. Fat they are more flexible and resilient, but less absorbent than thin coatings. In all cases, it is best when coating a support to proceed by successive layers, instead of proceeding in a single layer in thickness.
On this layer will be applied as paint, complete it somehow allows the sizing and colors hang properly and determines the appearance of the final painting. Can be obtained easily ready commercially based chalky white from Spain or the Meudon.
Several manufacturers offer synthetic coatings "universal" means "lean" which advantageously replace the previous ones and are marketed under the name
"gesso"
Suitable for both oil than acrylic, they are composed as often acrylic medium and whiting, or chalk and acrylic. which it is possible to add pigments for tinting. It is necessary to comply with a drying time between each application to obtain a surface white, matt and semi-absorbent.
It proceeds as follows for application:
-st step:
strongly dilute the gesso with 30% water.
-Step 2: Less
dilute, pass and shoot well for the preparation strongly impregnate the support.
To assess the degree of drying, stick to the advice of the manufacturer.
(Note that support wood will take longer to dry than the canvas
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