Sash Windows - journey into the unknown #9: I knew I should have used oil based paint

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Not that it really matters, the hopelessly optimistic completion date of mid October for the windows has been and gone, and there's still a way to go.
I think I started painting them in September, but the limited amount of space I have has meant having to do 5 rounds of painting - top sashes / bottom sashes /  frame bottom / frame / mouldings.
Each round of painting has been 2 coats wood preserver, 2 coats biocidal primer, 2 coats undercoat, then two topcoats - all by brush as I didn't care for the stippling left by foam roller.
All of my online research pointed me towards Zinsser Allcoat WB gloss, mainly because it too contains a biocide, is highly flexible and lasts 15 years.
The curing time though is unreal, I still haven't got around to glazing the sashes because although touch dry, there is still a tackiness to the paint that is only just going off now.
Once this batch of six windows are done there are two more windows for the front of the house which will need to done the same way for consistency, but when it comes to the back of the house  I will switch to oil based - or I'm toying with the idea of buying a gazebo to use as a spray booth in the back garden.... or I might be better off doing the next windows in Accoya which would only require half the finishing.
All in all I'm happy with the windows, but a bit disappointed with how long they are still taking, and glad that I'm not  making them for anyone other than myself, at least I'm not under any pressure to get them done.


This is that flexible sealant again on the inside corner of jamb and cill to prevent water ingress, applied over 1st coat of undercoat, then undercoated again.
Windows took me a lot longer than I had expected. There’s always something that slows the process down. Hang in there, and take satisfaction in a job well done, and which will probably outlast you.

May you have the day you deserve!

No idea,  but I think the longer the paint has to cure before being exposed to the outdoors,  the better.
Nice to have projects with no deadlines,  no pressure, except self applied  :)

Figuring out how to do something you have never done is what makes a good challenge.

I looked at a few Painters forums to see what the pros top rated exterior  paint was, the Zinsser allcoat came out on top. I can only think that it dries differently outdoors on top of old coatings, or maybe I overdid it with the basecoats.
In the past I have seen that hardware processed in an Accoya frame started to rust, due to the treated wood. So Accoya can also have its disadvantages. The hardware was in a tilt and turn window.

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