Painting the inside trunk

I started paint the trunk last night and the splatter paint don't go very far. They say on the can it will cover 6 sq ft, but I think it's more like 3. I got one wheel well the inside panel paint with one can. It look like it is going to take about 4 can to cover everything and make it look nice.
Also I bougt the first can at Advance Auto for $9.59 and pick up 2 more (all they had) at Murreys for $5.19 a can. So check around on price if you go with the splatter paint.