Matching color on Dometic awning

Looking for any insight on matching the white on a Dometic Awning. I have an area about 3" x 3" that I scuffed on one of the awning arms. I contacted Dometic and they do offer a touch up paint in a spray can, however they want $43 plus tax and shipping. Thought I'd do a little research trying to come up with a little less costly way of touching it up before going that route. Does anyone have a color matching technique or knowledge of what the spec is for their awning?