Better picture.
The noise in the color is caused by
printing quality issues, and would probably not show up on a properly printed model.
The roughly exact procedure that was followed on this test piece is as follows:
Day 1:
Polish using Dremel 512S fine abrasive buff; model will feel soft rather than sandy after this
Spray with Motip Plastic Primer, everytime just two quick sprays on front, back, left, right, top, bottom; it'll look wet for a few seconds; not visible afterwards
Wait 1 hour
Spray with primer again
Wait 1 hour
Polish using Dremel again (can probably be skipped, makes no difference).
Spray with primer again
Wait 1 hour
Spray with primer again; you'll still see nothing of the primer afterwards
Day 2:
Spray #1 with Motip Clear Varnish ACRYL
Wait 1-2 hours; you won't see anything of the varnish.
Spray #2
Wait 1-2 hours; you might see some small glittery sparkles
Spray #3
Wait 4-5 hours; the surface will be slightly sparkly now
Spray #4; surface will start showing rough gloss
Day 3:
Spray #5
Wait 4-5 hours; the surface will look like glossy cloth
Spray #6
Wait 1-2 hours; the surface will look glossy, but the stepping of false flat surfaces is clearly visible
Spray #7
Wait 4-5 hours; the surface will look glossy, the stepping will show trough slightly wobbly
Spray #8
Wait 4-5 hours; the surface will look excessively glossy, stepping is nearly unnoticable
Spray with Motip Matte ALKYD Varnish; the surface will immediately look matte, and will stay as it looks now.
Let dry for another 24 hours.
You might need less or more layers depending on your wait times and the print quality of the model.
Will try to reproduce this somewhere around next week maybe.