Gareki!: After School of Modeler Girls

[MangaDex]

 

[drmana]

This manga has the only explanation for what surfacer does I have ever seen. I see on the shelf at my local hobbytown, asked the guys at the counter they didn't know. We mainly use rattle cans which cover up and hide mold lines in a thick base layer after sanding.
I really enjoy this manga, Komoda is the best kaiju, and Thank you uploader.

 

[BeardyMcGee]

Definitely worth a read if you're in the Gunpla/model hobby.