"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