What primer to use

[Jacques Reed]

Should have added this to an earlier posting.

Here is my roof after coming out of the caustic bath and first pressure wash.

Remains of "red primer" can be seen at bare metal level.

It took another dunking to remove all the primer.

Sandblasting would leave fine scratches in the sheet metal which many people like as they feel it give a good key for the primer. Again, personal preferences, but I prefer not to have the fine scratches and use Wattyl Super etch on the bare metal after the molasses bath and a wipe of metal prep followed by either Wattyl or Wagon Paints primer.

Cheers,