Sash window painting

[bobjenga]

I need to repaint the interior of my sash windows but just want to check the steps.

Ive given them a good clean but still need to sand then down and remove loose paint.

Once that done should I use wood filler or something else to fill the gaps between the window and wood? Or use putty?

Then I suppose prime bare wood then paint?

 

[Wayners]

2 pack wood filler would work but be tidy..
Maybe use masking tape to protect area you don't want to get it on and to stop scratching when you sand.
Sandpaper can scratch glass and plastic and many things so masking is a basic protector.
Gaps that move but are narrow caulk is good.

 

[bobjenga]

So sand a scrap all loose parts, then use 2 part wood filler for the gaps and use tape to protect glass?

Should i use a bit of wood hardener first before using the filler?

 

[Diver Fred]

Sand the loose paint and timber off. Yes to wood hardener. Fill the gaps with flexible, paintable filler. Allow to dry then paint using your preferred system.

In the older days the gaps would have been filled with linseed oil putty - but that does harden over time.

 

[opps]

I suspect that the timber has been subject to condensation.

Is the timber soft to the touch when you try to push a screwdriver into it. If not, I would use caulk or a MS polymer such as CT1.

That said, any "fix" is likely to fail in time if you have condensation on cold days.

 

[bobjenga]

Finished most of the job but the join between the glass and the wood isnt as neat as i'd like.

Can I use some sort of gun sealant to neaten this up? It's already painted so I wont be painting over it which means it needs UV resistance I suppose? And flexible? Something like the OB1 Multi-surface? - https://www.screwfix.com/p/ob1-mult...ml/514jf#product_additional_details_container

I have a couple more windows to do on the other side of the house so if I were to paint those could I use a chalk sealant first and paint over that?

 

[opps]

OB1 is UV resistant.

The other windows- caulk prior to painting will be fine.

Again, the longevity is function of the degree of condensation.