Sizing water colour paper for oil painting

sizing water colour paper
Sizing paper reduces the absorbency of the sheet and is usually only required when printing or painting with oil colour on paper. On the other hand, priming paper changes the colour, texture or absorbency of the sheet and prevents the oil from oil paint being absorbed which is necessary so that the pigment is not left underbound on the surface.

Sizing Paper

Size: Either Rabbit skin glue or gelatine are recommended under Oil Painting Primer. Use a dilution of 5g to 142ml of water and soak it before dissolving by warming.  Vegetarians may prefer to use a cellulose size like wallpaper paste, however its sizing abilities are not as good. Diluted acrylic emulsion can be used under acrylic primer but is generally unnecessary.

Procedure: Ideally the paper should be stretched and dried beforehand to prevent cockling.  Papers which are already externally sized will only need one coat of size whereas internally sized sheets should have two coats of size, allowing the first to dry thoroughly before applying the second.

Priming Paper

Priming paper changes the colour, texture or absorbency of the sheet and can be done with acrylics primer, acrylic colour or a mixture of both.  For oil colour however, a thin coat of undiluted Acrylic Gesso Primer is recommended.  If an alkyd primer is required for oil colour, rabbit skin glue should be underneath.  Oil paint is completely stable when painted on properly prepared paper any weakness of oil on paper would be due to the lack of rigidity in the sheet versus a board or canvas.

Procedure: Ideally the paper should be stretched and dried beforehand to prevent cockling if a lot of moisture is involved and we would recommend that you use as good a quality primer as possible. It’s important to start with a good quality surface as as poor priming can’t be resolved later during your painting.
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