Hi, lads , does somebody know how to repair cracked Pitched Stucco Aluminium painted roof.There are plenty of cracks some of them small some upto 20mm deep 30mm wide and 4 m long. I think it's possible to fill big crack with a Betumenant Mastic but I don't know if I have to prime them before and with what if yes ? And i want to paint all roof(75m sq) with Betumenant Paint, how it will work with aluminium coat underneath and should I prepare surface somehow ? Thanx. 
