Sand out the defect using a 3M™ Hookit™ Cubitron II Abrasive 75mm Disc - 150+ / 220+. From its eastern terminus between Redcar and Middlesbrough it runs past Stockton-on-Tees and Darlington mainly as two-lane dual-carriageway and single carriageway past Darlington, becoming motorway standard as the A66(M) shortly before meeting junction 57 of the A1(M). 3m collision repair academy. This needs to be welded into place and properly finished for the best job. This is Collision Repair from 3M.