Working with acrylic on canvas

Medium : Camel Series 1 & 2 Artists' Acrylic colours
Base : Pre-primed canvas

Dear readers,

Few problems that I have noted so far that could just be the limitations of the medium

1. On an unprepared surface, a thin, unsettled film can wear off easily.
2. A rough canvas attracts loads of dirt and graphite dust and is difficult to clean with an eraser.
   

Regards.

Edit : 1. The partial wear offs can be used as textures. 2. Acrylic gesso can mend these areas but since I did not have that, I had to do with a large tube of titanium white.