In this quick guide I will explain you how to prepare your print for painting.
Primer: Remove imperfections
Before painting, any filament residue or printing error should be removed.
Primer: Sanding the surface
First of all you apply the spray putty spraying it on the object with alternating vertical and horizontal passes keeping the can at a distance of about 30 cm from the object.
Attention: the more you pass the primer, the more you run the risk of covering the small details.
Once the grout has dried, first sand it down with sandpaper soaked in water with a thick grain (usually 100). And then, to scale, you use finer grains (first 150 or 180 and finally 220-240).
Personally, I also use sponges for details or in areas that are more difficult to reach.
This process can be repeated several times, alternating filler and sandpaper until you reach the desired result.
Cleaning and Primer
With paper or anti-dust cloths it is necessary to clean each point well to avoid dust deposits due to sanding, which could not stick the primer or even less the colors.
After cleaning thoroughly, it’s time to give the primer that will be essential to adhere to the colors we want to use, whatever they are. I recommend using a primer spray for plastic, specifically leaning towards a light gray primer but, depending on the colors that will be applied later, can also fit a white or black background. The primer is applied with the same procedure as the spray grout, taking care to completely cover the object.
If you want a superior finish I recommend the grey modeling primer by Tamiya, it costs a little more but it is definitely worth it.
Here we are! After waiting for the primer to be dry, here is your 3D printed object ready to be painted!