Paint synthetic resin paint on existing acrylic paint

If some conditions are met, it is easily possible to apply a synthetic resin paint on an existing acrylic paint. A completely dried acrylic paint corresponds to other pre-painted or painted substrates. For doors and frames or windows and frames, different paints are recommended.

Several weeks drying time

The absolute prerequisite for the successful application of synthetic resin paint on acrylic paint is the perfect through-drying. Since acrylic varnish dries from top to bottom, it often gives the impression after just a few days that it is dry. In fact, drying times of three to four weeks are required to reach the non-surface side of the acrylic finish.

Old acrylic paint presents no particular challenge. It can be well prepared by sanding as with other coverings or untreated brushing grounds. Thorough dedusting after sanding is important, because otherwise the sanding dust acts like a separating layer.

Primer as a liability aid

Inadequate preparation of the acrylic paint, apart from the ensured perfect through-drying, can lead to adhesion difficulties of the synthetic resin paint. If roughening with approximately 120 or 150 grit abrasives does not appear sufficient, a special intermediate layer can be applied as a primer and primer. The adhesion promoters are referred to as primers.

While synthetic or alkyd resin varnish can "hold on" to acrylic varnish, the reverse order is not possible. Water-based acrylic lacquers only last on synthetic resin lacquers when a highly effective primer is interlayered.

Coating tools and paint type determination

Brushes with plastic bristles and resin bristles with natural hair bristles should be used as suitable coating tools for acrylic varnishes. Foam painting rollers are equally suitable for both types of paint.

If it is not possible to unambiguously attribute an old finish to a type of paint, a test with an aggressive solvent is recommended. Acrylic varnish dripped on a cloth solves acrylic varnish in any case, synthetic resin varnish not. As a counter sample turpentine can be applied, which can not attack acrylic paint.

Tips & Tricks

If you paint surfaces that hit each other, such as doors and frames or windows and frames, you must make sure that the selected acrylic paint is a "block-resistant" product. An even greater security against later sticking offers you the use of acrylic and synthetic resin paint for the two surface sides. Usually offers synthetic resin paint for the frames or frames.

Video Board: How to Varnish an Acrylic Painting