Painting radiators, railings

New heaters, primed with an undercoat paint, intended for painting. The primer paint on radiators has good adhesion, but at the edges it is partially torn off. Please list the steps for applying the correct coating
These steps are as follows::
1) supplementing the base layer with a primer;
2) precoating with radiator varnish;
3) surface painting with varnish for radiators.

Stare, strongly yellowed radiators are to be repainted. The old coating holds up well and there is no damage. Please list the necessary activities related to painting radiators
These steps are as follows::
1) sanding off old paint and cleaning the surface;
2) precoating with radiator varnish;
3) surface painting with varnish for radiators.

The new steel balustrade of the stairs was primed with anti-corrosion alkyd primer paint. Primer paint shows good adhesion, but mechanical damage was found. Please list the activities related to painting works
These steps are as follows::
1) cleaning the substrate and rusting steel to the degree of cleanliness St3;
2) repair of the base coat with a lead-free anti-corrosion alkyd paint;
3) precoating with alkyd varnish;
4) topcoat with alkyd varnish.

Hand-wrought iron entrance gate was painted. After half a year, the paintwork peeled off the hot forged places. What is a cause of it?
As a result of the spontaneous binding of oxygen, a scale formed on the red-heated parts. This scale had to be removed before painting. Because it has not been done, the scale falls off due to thermal and electrochemical stresses.

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