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Do-it-yourself tips for decking before repainting:

Should we stripping before painting?

Water color.
Rub the flat of the hand over the paint. If the fingers are covered with dust, it means that the paint has "floured". It must be stripped.

how to know if you need to strip the paint before repainting

Oil painting.
Glue pieces of tape in places. If, by tearing them, pieces of paint remain stuck, it must be stripped before any other operation.

Acrylic paint on glycero

On a used wood support, painted with glycerol paint, how to pass a new layer with acrylic paint?
Christian Pessey's answer:
It is not advisable to pass a water-based paint (acrylic paint) on a glycerol paint, which enters the family of paintings "in oil" (the oil and the water do not mix).
The ideal is of course to strip the wood to start on a healthy surface. However, after a good sanding, it is quite possible to apply an acrylic paint on the support. For safety, you can also pass a layer of primer to "isolate" the two types of paint.

Glycero with water

I heard about glycerol paint "with water". Is it the same as a classic "oil" glycero. Is it also effective for repainting a kitchen?
Christian Pessey's answer:
Traditional "glycero" paints are products based on glycerophthalic resin, oil, solvent and pigments. Resistant, waterproof, offering a beautiful finish, these paints were perfect for making lacquers in wet rooms: the kitchen or the bathroom. But they contained solvents harmful to humans and the environment. Europe has therefore programmed their ban (Directive COV-2007/2010). Not wanting to lose the commercial advantage of the name "glycero", some manufacturers still use it to designate, in fact, alkyd resin paints, emulsion and aqueous phase. Their content of volatile organic compounds (the famous VOCs) is low and their qualities very close to those of conventional glyceros.

Video Instruction: Preparing Walls for Painting