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I've been renovating sashes to a greater or lesser degree for 25+ years. I wouldn't trust plastic and tape, I usually use a thin plywood with some batten holding it in. Sanding down can take quite a while if there's a lot of flaking paint. You should probably use Repaircare as it's an epoxy resin that's designed for this job but the starter kit is expensive. Paint with BIN Aqua and Allcoat. I don't think it's something I would necessarily be able to get done in 2 days and I have all the tools and experience. I might also have to operate to a higher finished standard because people are paying me.
If you don't have to carry out extensive repairs and you're prepared to work long hours you might get it done in a weekend. Probably not a good idea at this time of year though.
Pictures would help to assess the likely issues.
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Airhead
TTM
I have a wooden sash window in urgent need of renovation and wanted to check method and likely time scale with anyone who’s done this before.
So, remove lower and upper sash and tape up window with plastic.
Sand down flaking paint with coarse paper.
Fill any problem areas with wood filler (any specific filler I should source for this?), let dry and sand these areas down.
Paint with primer (bin123 or something else?)
Let dry and then 2 coats of white exterior wood paint (I’d be grateful if any specific paint recommendations).
Is this all doable in a weeeknd?
Thanks in advance