Workpieces that have to be repainted or painted are usually covered with a layer of old paint. This must be removed. Sanding off old coatings is the classic and widespread method, but it is not always applicable. Alternatively, solvents can then be used to remove the paint.
Loosen paint that is still wet or already dried
There are several techniques you can use to remove paint from workpieces. First of all, the decisive factor is whether the paint is already dry or still wet. If the paint or varnish in question is still wet, it is often much easier to remove. For example, acrylic paint is water-soluble as long as it is still wet. However, it can hardly be removed dry.
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Many different colors and varnishes
But acrylic paint is just a color. There are many different colors and varnishes. Here is just a small selection of frequently used paints and varnishes:
- Acrylic varnish
- Acrylic paint
- Synthetic resin paint
- Emulsion paint
- Silicate paints (water glass)
- Mineral paints
This selection already makes it clear that there is no general solvent that could be used for all paints and varnishes. You always have to choose the right solvent according to the color composition. For example, you can use acetone for acrylic paints.
Silicate paints cannot always be removed
Silicate paints (water glass), on the other hand, can hardly be removed. Depending on the substrate, for example on mineral plasters, a chemical process, silicification, starts. The silicate paint forms a firm bond with the substrate. Water glass can therefore only be removed if the plaster is chipped or removed accordingly. is removed.
Lye or acidic solutions are suitable for many paints and varnishes. Then it is also said that the colors are stripped. In addition to dissolving old varnishes and paints, solvents can also be used to dilute paints and varnishes. So before applying.
Different processes when curing colors
The special properties of the paint must be taken into account, explicitly how they dry. There are lacquers and paints that network. This cross-linking requires two different components: the hardener and the paint, the resin part. If both parts join, a reaction occurs and the paint hardens.
Use of solvents depending on the individual tasks
As long as you treat a surface with this paint that is exposed, you can also use thinners that evaporate quickly. However, if you want to do something like lamination, where the now thinned paint would no longer be exposed, you must not thin. The solvent used could no longer sufficiently evaporate and thus weaken the crosslinking.Tips & Tricks On the other hand, there are lacquers and paints in which the hardener does not form a compound, but accelerates the drying and hardening process. Here you can add such solvents without any problems, as they evaporate quickly - like the actual hardener.