The choice between repair and replacement may sometimes by based on the physical condition of the damaged member or the relative cost of the two methods of reinstatement. Often this may be a straight forward decision. In other circumstances the decision may be more involved. Cost estimates for the total job will require consideration of a number of expenses that might not be immediately apparent: temporary walls and coverings, supports and underpinnings, partial demolition and transport of debris, addition to supports that become damaged during tearing down of damaged parts, removal and replacement of sound walls or roofing torn out to provide access. The most common approach to repair is to patch the old member with concrete and steel to the required dimensions and the required load carrying capacity. The new dimensions and design will perhaps approximate the original but not always. The new concrete may be placed in forms or applied by shotcreting, depending largely on relative convenience of the methods in a given instance. When the exposure to fire has been only brief, the surface may be crazed. Such crazing is too shallow to have a significant effect on strength but it gives a bad appearance. Treatments to improve uniformity of appearance include painting with a good grade of latex paint or painting with a portland cement base paint that contains a powdered latex. The latter restores a concrete- like finish.