So I'm doing some polishing work on a timing cover and I'm also trying to fill in some rough spots



I got these aluminium soldering rods http://www.canadiantire.ca/AST/brows....jsp?locale=en

But for some reason the solder won't stick to the timing cover at all. I just falls off. Isn't the timing cover suppose to be made of aluminium, or am I mistaken?

 

Looks like cast to me so solder won't stick to it

 

Aluminium solder doesnt stick to cast aluminium but it does to other types of aluminium?

 

Could be the metal is also real dirty. Needs to be super clean for it to stick right.