Need your help on body filler............
I have decided to tackle the surface rust on my arches and they have come up really well apart from the area where I needed to fill.
Basically I'm using isopon filler with the hardner but everytime I go to rub down, after a while the filler just comes off. The I'm reading the instruction correctly and it says the correct mixture (hardner and filler) is not essential.
I'm using a light/fine sanding block which I got from Halfords but no joy
Can anyone help