Unibond repair metal for good is a polyester based filler that permanently repairs fills replaces and bonds metal including steel cast iron aluminium copper and brass easily repairs leaks in water pipes gutters and radiators will also bond metal to wood and masonry mix and use carefully and thoroughly according to pack instructions in a well ventilated area wear suitable gloves sets hard in 10 minutes do not use at temperatures below 5 c sets translucent can be painted sanded or drilled and is