Bianca Boya
ara ara ara  
 
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Professional Opinion
Sandpaper tracks

Reasons:
-The used sand paper was not proper for the surface.
-The polishing with sandpaper was performed before the putty or primer were dried completely.
-The last layer was applied too thin.

Solutions:
-It should be used the proper sandpaper for the surface.
-Drying periods should be taken into consideration.
-The paints should be used by applying their correct dilution ratios.