Rust marks coming through.

rickyroma

We have a wooden stair bannister in white.  For the 4 years we have lived here we have had a problem with rust marks, from the buried nails/screws, coming to the surface.  Three months ago I gave it 2 coats of Dulux Stain block White Primer & undercoat which is supposed to treat this problem. A top coat of satin wood was added too.
Already, I can see the faint trace of these rust spots working their way to the surface again. 
Any tips how this can be cured please? 

Section62

rickyroma said:

We have a wooden stair bannister in white.  For the 4 years we have lived here we have had a problem with rust marks, from the buried nails/screws, coming to the surface.  Three months ago I gave it 2 coats of Dulux Stain block White Primer & undercoat which is supposed to treat this problem. A top coat of satin wood was added too.
Already, I can see the faint trace of these rust spots working their way to the surface again. 
Any tips how this can be cured please? 

Try an oil-based paint.

If you don't want to do the whole bannister with oil-based paint then dig out the filler over the nails/screws, 'spot' them with the oil-based paint, then refill/sand/paint the surface.

bjorn_toby_wilde

Zinsser do an oil based stain blocking primer called Cover Stain.  I’ve found it excellent but take a look at the reviews online if you want a broader opinion.

I will add that it’s quite thick and opaque. That’s a real plus but on a hot day like today you might need to thin it with a little white spirit or it’ll be drying as it leaves the brush!

Grenage

Another vote for oil-based. 

daveyjp

Change the screws for brass or stainless steel.

rickyroma

bjorn_toby_wilde said:

Zinsser do an oil based stain blocking primer called Cover Stain.  I’ve found it excellent but take a look at the reviews online if you want a broader opinion.

I will add that it’s quite thick and opaque. That’s a real plus but on a hot day like today you might need to thin it with a little white spirit or it’ll be drying as it leaves the brush!

This does look good. Wish I'd tried this instead of the dulux rubbish 

MysteryMe

I've used Zinsser with very good results, use an old brush that can be disposed of rather than anything decent.

FreeBear

bjorn_toby_wilde said:

Zinsser do an oil based stain blocking primer called Cover Stain.  I’ve found it excellent but take a look at the reviews online if you want a broader opinion.

I will add that it’s quite thick and opaque. That’s a real plus but on a hot day like today you might need to thin it with a little white spirit or it’ll be drying as it leaves the brush!

Some of the Zinsser products are shellac based, so you'd need to use an alcohol to thin it rather than white spirit.

Methylated spirits or isopropyl alcohol would work.

Zekko

Zinsser Cover Stain is what you need here.

bjorn_toby_wilde

FreeBear said:

bjorn_toby_wilde said:

Zinsser do an oil based stain blocking primer called Cover Stain.  I’ve found it excellent but take a look at the reviews online if you want a broader opinion.

I will add that it’s quite thick and opaque. That’s a real plus but on a hot day like today you might need to thin it with a little white spirit or it’ll be drying as it leaves the brush!

Some of the Zinsser products are shellac based, so you'd need to use an alcohol to thin it rather than white spirit.

Methylated spirits or isopropyl alcohol would work.

That’s true of BIN but I don’t think this one is shellac based. I did check with the Dulux Decorator Centre that I bought it from before I thinned it myself. They said white spirit.

The brushes also clean with regular brush cleaner whereas the shellac based BIN needs meths.