On Friday, 3 August 2007 10:36:09 UTC+1, nafuk wrote:
Hi, I've built an extension and an outside wall is now inside. I want
to paint the wall white. The wall has been painted by the previous
owners with some thick black bitumen paint.

Trying to remove some using a wire brush on a drill or a 4" grinder
does remove some of it but leaves a smear that can be removed quite
well with a rag and some petrol!

There is a quite alot of this wall so:
do I need to remove this stuffbefore painting?
if I do, is there a quicker/better way than wire brushing?

Thank you

Hire a sand blaster.