render has come of the wall to bare brickwork,these are the old solid bricks like engineers bricks,my plan of attack is to dampen wall down remove dust,give a coat of bonding then multi finish on top,how long do i wait till i multi on top of the bonding coat,its come off on two sides of the wall,in the corner,around 3 feet per side,does this plan sound good,did a search but was not sure of what i read,saw nothing about these kind of bricks,thanks