When you have selected the right paint for your project, the preparation of the surface follows. Because: The surface on which you want to paint is even more important than the suitable color. Only thorough preparatory work guarantees a good end result. Our guide outlines how to prepare a surface for painting correctly.
Steps to prepare a surface for painting correctly
The first step to prepare a surface for painting correctly isthat clear signs of wear such as dents and nicks are first filled with a spatula and smoothed off. Here it is important to stay in the “solvent system”. Acrylic spatulas are used for acrylic paints, so-called oil spatulas for synthetic resin paints.
Test which varnish was once painted with a brush that you previously immersed in universal thinner. Rub it firmly on the paint surface. Acrylic paint will dissolve, synthetic resin paint will resist the attempt.
Old paint coats have to be roughened to be load-bearing for the new paint. Here the rule is called grinding three times: with 80, 100 and 120 grits.
For curved surfaces, neither the machine nor the sanding block should be used, so-called sanding sponges have proven to be particularly practical here, since they largely adapt to the surface. They are available with two different grits on one sponge.
If you are not afraid to use chemicals, you can also use a special lye that dissolves the surface and roughens it.
Remove sanding dust thoroughly before painting
Sanding dust is an enemy of the good paint surface. It must be removed thoroughly before painting. You can do this with a lint-free, damp cloth and some drying time for the surface.
Modern dust cloths are not recommended. You can leave wax on which the varnish does not adhere. Painters also use linseed oil putty (window putty), to which the dust sticks, which is then simply kneaded.
Before painting, a pre-coat is recommended as a safe adhesive bridge and at the same time uniform lightening of the surface.
Alkyd resin paint or acrylic paint?
In terms of quality, it is almost the same today whether you work with conventional alkyd resin or acrylic paints. Although an alkyd resin varnish still has small advantages in processing, there is no difference in quality in the living area.
But there is still a difference between branded paints and so-called private labels. Here the recipes can differ enormously. The cheaper private label varnishes often contain smaller amounts of high-quality ingredients, such as pigments and binders. In most cases, cheaper fillers are used as replacements. The consequences are, for example, lower opacity and the need for a second coat.