Treating old wooden window frames - we have some oldish window frames
where pain flakes off fairly quickly when applied. The house was built
1970's, to a not terribly good standard. I assume the frames are treated
softwood, because there's no rot, but the surface of the wood has dried
out and is all grainy. Hence, the paint goes on, but does not last. All
the other houses in the road have plastic double glazing. Is this a hint?

On 24/07/15 09:20, GB wrote:
Treating old wooden window frames - we have some oldish window frames
where pain flakes off fairly quickly when applied. The house was built
1970's, to a not terribly good standard. I assume the frames are treated
softwood, because there's no rot, but the surface of the wood has dried
out and is all grainy. Hence, the paint goes on, but does not last. All
the other houses in the road have plastic double glazing. Is this a hint?


I've found aluminium primer quite good in the situation.

GB wrote

Treating old wooden window frames - we have some oldish
window frames where pain flakes off fairly quickly when applied.

Clearly it was a S&M dungeon at one time.

The house was built 1970's, to a not terribly good standard.
I assume the frames are treated softwood, because there's no
rot, but the surface of the wood has dried out and is all grainy.
Hence, the paint goes on, but does not last. All the other
houses in the road have plastic double glazing. Is this a hint?

Unlikely unless you are into minimal maintenance.

Sandpaper is your friend...

Jim K

JimK wrote

Sandpaper is your friend...

Depends on how intimate you get with it.

On 24/07/2015 11:37, Rod Speed wrote:


JimK wrote
Sandpaper is your friend...

Depends on how intimate you get with it.

IME wood hardener is what you need. Fibreglass resin is cheap enough in
Halfords and works well as long as the wood is dry. There are probably
sophisticated epoxy systems too.

On 24/07/2015 14:02, stuart noble wrote:

IME wood hardener is what you need. Fibreglass resin is cheap enough in
Halfords and works well as long as the wood is dry. There are probably
sophisticated epoxy systems too.

There are. Thin, runny, brushable epoxy.

Wooden boats are usually epoxy coated from new, works much better than
primer.

Andy

On Fri, 24 Jul 2015 09:20:22 +0100, GB wrote:

Treating old wooden window frames - we have some oldish window frames
where pain flakes off fairly quickly when applied. The house was built
1970's, to a not terribly good standard. I assume the frames are treated
softwood, because there's no rot, but the surface of the wood has dried
out and is all grainy. Hence, the paint goes on, but does not last. All
the other houses in the road have plastic double glazing. Is this a
hint?

Not an expert painter, but I would have thought that if the paint flakes
off then the wood has not been properly cleaned, primed and undercoated.

Paint should stick to wood if the wood is clean and dry when painted.

Is it possible that the frame is hardwood?

In which case I think it will need a different (aluminium?) primer.

You can also get a primer/filler which will fill in the grain - but wood
which is not smooth should still take paint, so I suspect that there is
another reason that the paint isn't sticking.

Cheers

Dave R

--
Windows 8.1 on PCSpecialist box

In message , David
writes
On Fri, 24 Jul 2015 09:20:22 +0100, GB wrote:

Treating old wooden window frames - we have some oldish window frames
where pain flakes off fairly quickly when applied. The house was built
1970's, to a not terribly good standard. I assume the frames are treated
softwood, because there's no rot, but the surface of the wood has dried
out and is all grainy. Hence, the paint goes on, but does not last. All
the other houses in the road have plastic double glazing. Is this a
hint?

Not an expert painter, but I would have thought that if the paint flakes
off then the wood has not been properly cleaned, primed and undercoated.

Paint should stick to wood if the wood is clean and dry when painted.

Is it possible that the frame is hardwood?

In which case I think it will need a different (aluminium?) primer.

You can also get a primer/filler which will fill in the grain - but wood
which is not smooth should still take paint, so I suspect that there is
another reason that the paint isn't sticking.

It probably just needs a god sand to get it down to good wood, it sounds
like the wood has weathered where it keeps flaking off.
--
Chris French

On 26/07/2015 20:38, Chris French wrote:
In message , David
writes
On Fri, 24 Jul 2015 09:20:22 +0100, GB wrote:

Treating old wooden window frames - we have some oldish window frames
where pain flakes off fairly quickly when applied. The house was built
1970's, to a not terribly good standard. I assume the frames are treated
softwood, because there's no rot, but the surface of the wood has dried
out and is all grainy. Hence, the paint goes on, but does not last. All
the other houses in the road have plastic double glazing. Is this a
hint?

Not an expert painter, but I would have thought that if the paint flakes
off then the wood has not been properly cleaned, primed and undercoated.

Paint should stick to wood if the wood is clean and dry when painted.

Is it possible that the frame is hardwood?

In which case I think it will need a different (aluminium?) primer.

You can also get a primer/filler which will fill in the grain - but wood
which is not smooth should still take paint, so I suspect that there is
another reason that the paint isn't sticking.

It probably just needs a god sand to get it down to good wood, it sounds
like the wood has weathered where it keeps flaking off.

It's the old story of the solvent being sucked into the wood so that the
paint cannot form a proper film. IME wood hardener is the answer. If
you've done the hard work to get back to bare wood, it really is a no
brainer.
Not sure about the "new" breed of one pack wood hardeners. They appear
to be based on moisture curing resins but I would always have more faith
in a 2 pack system