I'm finishing my basement. The foundation walls are in great shape and are painted with latex paint. Instead of attaching furring strips or framing and drywall, I'd like to just use the concrete walls. But because they are concrete, you can still see irregularities, etc, where the forms once were. Is there a thick material I can apply to the walls to cover the irregularities and smooth out the walls? Block fill is not thick enough. Joint compound sticks and looks great - but can I do that with joint compound? Or is there another material? Removing the paint is out of the question.