We have plenty of experience in window restoring and repainting old Sash windows and French doors with very good results.
It is all about the preparation work which at the end of the day will produce a great result. The team will begin with scraping off the old flaking, blistering paint and sanding all the timber.
Window repair might be needed if glazing putty is too old or missing or timber is broken or stuck into the frame.
It’s better to plane swollen parts before painting. This is because after painting the window frames it would only stick in more and damage the finished paint work.
Next step is filling and gapping cracks and sanding the repaired surfaces before the actual painting begins. Bare surfaces need a primer or sealer first, then the whole window will be undercoated to build up some body of paint before the final coat can be applied.
The proper painting preparation work pays off at the very end when old, worn out timber can look like an amazing feature of the house again.