rust showing through paint
 

Hi,

Some rust spots have appeared on my window sill. I am sure these must
be the nails heads. I can imagine some condensation may have wet the
sill but I am surprised the nails have rusted. I sanded it back to the
wood and painted with primer and undercoat that were both solvent
based. Shouldn't they have kept the water out? The top coat was that
new Dulux water based gloss (yuck!). What is the best thing to paint
over the nail heads with to stop the rust stains coming through again?

Thanks in advance.
Robert.

rust showing through paint
 

Robert wrote:
Hi,

Some rust spots have appeared on my window sill. I am sure these must
be the nails heads. I can imagine some condensation may have wet the
sill but I am surprised the nails have rusted. I sanded it back to the
wood and painted with primer and undercoat that were both solvent
based. Shouldn't they have kept the water out? The top coat was that
new Dulux water based gloss (yuck!). What is the best thing to paint
over the nail heads with to stop the rust stains coming through again?

Thanks in advance.
Robert.

knock em under the surface and fill with car body filler.

rust showing through paint
 

On Aug 27, 10:10*am, Robert wrote:
Hi,

Some rust spots have appeared on my window sill. I am sure these must
be the nails heads. I can imagine some condensation may have wet the
sill but I am surprised the nails have rusted. I sanded it back to the
wood and painted with primer and undercoat that were both solvent
based. Shouldn't they have kept the water out? The top coat was that
new Dulux water based gloss (yuck!). What is the best thing to paint
over the nail heads with to stop the rust stains coming through again?

Thanks in advance.
Robert.

use oil based gloss, not water based


NT

rust showing through paint
 

"The Natural Philosopher" wrote in message
...
Robert wrote:
Hi,

Some rust spots have appeared on my window sill. I am sure these must
be the nails heads. I can imagine some condensation may have wet the
sill but I am surprised the nails have rusted. I sanded it back to the
wood and painted with primer and undercoat that were both solvent
based. Shouldn't they have kept the water out? The top coat was that
new Dulux water based gloss (yuck!). What is the best thing to paint
over the nail heads with to stop the rust stains coming through again?

Thanks in advance.
Robert.

knock em under the surface and fill with car body filler.

Or any wood filler. Before you knock them under the surface, check what
might be on the other end. Doing window frames last year, I found the nails
lifted the paint on the inside when I knocked them from the outside. You
might end up having to knock them through, snip the end off and then knock
them back and fill both ends. Also fiddly were star shaped pins in the
corners of the windows themselves: but they seem to be aluminium.

S

rust showing through paint
 

Robert wrote:
Hi,

Some rust spots have appeared on my window sill. I am sure these must
be the nails heads. I can imagine some condensation may have wet the
sill but I am surprised the nails have rusted. I sanded it back to the
wood and painted with primer and undercoat that were both solvent
based. Shouldn't they have kept the water out? The top coat was that
new Dulux water based gloss (yuck!). What is the best thing to paint
over the nail heads with to stop the rust stains coming through again?

Thanks in advance.
Robert.

Use knotting and fill the holes with a non-water based filler.

As a matter of interest, what filler did you use before painting?

rust showing through paint
 

On Fri, 27 Aug 2010 03:29:53 -0700 (PDT), Tabby
wrote:

use oil based gloss, not water based

But I did use oil based primer and then oil based undercoat, so
shouldn't these have been sufficient waterproofing?

rust showing through paint
 

On Fri, 27 Aug 2010 23:18:33 +0100, "Cash"
wrote:

As a matter of interest, what filler did you use before painting?

I didn't. These are very small nails, pins you might call them, and I
don't remember seeing them when I painted. They look so small I can't
see what use they have. They are at the window edge of a bay window.
So no, I didn't use filler, I just overpainted them. It looks as
though I need to knock them deeper with a pin punch, fill, and
overpaint.