sample v4
Viacryl® seems to be still effective on the paint.
Were the gaps of paint formed before or after
Viacryl® application?
 

SEM confirms the microscope observations:
- there is organic compound (Viacryl®),
- there is no macro-cracks,
- the Viacryl® seems to be mixed to grisaille,
- deposits are in the gaps of paint (on/under
  Viacryl®?)