Sorry but the simple answer is dont bother, it is never successfull trying to panit a light colour over mahogony.First of all the surround i would think is made of very thin veneer on top of MDF or softwood, you would need to sand it down first the veneer would not stand up to this,also there would be a light coat of varnish to remove,paint will not adhere to varnish it will peel off in time.There are lots of paints on the market that manufactures claim they will cover this and that,they dont!! By the way you will never beat a brush for painting, rollers are very good for emulsion on walls and ceilings but thats it.save yourself time, money, and effort and look for a new surround. hope to have been some help anyway??