Question asked 2017-01-07 17:03:07 ...
Most recent comment 2017-01-07 17:24:00
Is it safe to apply fresh paint over or into a layer of paint that has begun to set and has become tacky? Is it safe to blend tacky paint? Can either of these cause adhesion problems, etc.? No medium is being used, only a little bit of solvent.
Answers and Comments
EditDeleteModerator AnswerThe question is a bit broad to answer easily. What type of paint are you writing about?
It is not considered good practice to paint over paint films that
have not had a chance to go through the drying process. This creates a
situation where the superimposed paint will dry far quicker than the
underlayer. This makes a situation where the under layer continues to
move while the upper layer become hard and eventually brittle. The upper
layer really can do little other than crack in this situation.
situation is quite different when it comes to blending. It is often
easiest and most effective for subtle blending if it is done when the
adjacent layers are tacky. Now this is different than trying to blend
two ajoining applications of paint that are thicker and have begun
to skin over. Attempts to blend at this point are likely to break the
skin and cause a general mess.
EditDeleteModerator AnswerSix months is not necessary. The general rule of thumb is that the paint should be dry enough so that you can press a finger nail into it and not leave an impression. We discuss this in our "Resources" section under "Mediums and Additives." I have copied that paragraph here:
If you are painting in successive stages and want to determine if the
underlayers are sufficiently dry for overpainting, one can use the “fingernail
test”: If you can press your fingernail onto the oil paint without making a
dent in it, you can continue to paint atop the surface without significantly
biting into the layers beneath if you avoid using too much solvent.
This Page Last Modified On: