Organbuilder Grind a groove in the crack just like you would if you were to weld crack. You don't want it smooth.The rougher the better. Use a 4" grinder with new wheel. Grind eash side of crack for 1/4".If possible have wheel off center to make rough cuts. Several coats, smallest first, Don't spread whole area at once,layer away from crack at 1/16 lapps.
