I found some cracks on the dashboard!
I repaired those cracks using "PLAREPAIR".
PLAREPAIR can be used on several plastics and it consists of powder and liquid. (I used black powder.)
If you mix the liquid into the power, you will get hard plastic about 5 minutes!
Fill the cracks with power and drop the liquid on the cracks.
I did those process several times until I filled the crack completely.
See below! Awkward!!!
And rasp roughness using sandpaper. The color of "PLAREPAIR" is slightly different from the dashboard. So painted
the dashboard using "Forever BLACK".