12mm x 12mm from outside look is very small. My windows grill is 1/2" x 1", facing 1".

If you doing 1/2" x 1" solid. I guess it will be 30+- / psf.

That price is exclude workmanship if i read "kucingfight" post.

Even you have solid, you need proper mount. Useless if just screw mount only. You need something like mounting gate, put the long bar inside the wall.

Why not use thicker steel? say 1.5mm

Got the very expensive i think is "hammerite" paint. No need to much scrapping, it suppose to take care of the rust too.

For normal paint, is best to brush it out the rust / loose paint using steel brush, apply primer, apply paint.

Grill / metal better apply primer easy to paint. Without is ok, just need some experience.

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Added on November 23, 2011, 10:02 pmI paint my old house grill. Well, actually not paint is spray. I got Bosch spray pump. Paint won't stick well on steel without primer.

This post has been edited by weikee: Nov 23 2011, 10:02 PM

Think is difference, i never use sealer much, i always ask for primer only. Primer term is same on wood, metal, and wall, but is not the same material (primer).

It help easy to paint and protect the object/subject too.

Spray is sure nicer but lots of preparation work. Cause the paint particle will fly to many area. Need lots of masking tape. And lots of paint too. If you buy ready can paint, you need LOTS of it. So usually people just use brush to paint.

Usually they will use mid size screw, weld it, then grind the head. Lastly paint it.