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Window opener swelling

T

tony.w

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Not to sure whether this should be in the finishing thread anyway I made and fitted a window with two openers and finished with couple of coats of Osmo only a light coat for the second and that was exterior only, this was back in the summer and now following a fair bit of rain both openers inner edge are catching the mullions.
The openers are externally hinged so I did take some material off the inner edge of the casement to allow clearance when swinging out but maybe not enough.

My questions are on a opener of approx. 350mm width how much clearance is acceptable prior to fitting also should I be finishing with two good coats Osmo and finally I going to have to remove a little bit more material from inner edge only just enough to clear as I’m guessing it will shrink back is sanding the best minimalist option or Trim router?
 
I usually put enough of a leading edge on the opening side so that when the corner of the casement is near the corner of the mullion as it opens, it's the same gap as when the casement is closed. When it's closed, I aim for a 3mm gap all the way around.

I've never liked Osmo as an exterior finish, I've found their products very lacking and they just don't hold up well compared to others like Sikkens.
 
Trevanion said:
I usually put enough of a leading edge on the opening side so that when the corner of the casement is near the corner of the mullion as it opens, it's the same gap as when the casement is closed. When it's closed, I aim for a 3mm gap all the way around.

I've never liked Osmo as an exterior finish, I've found their products very lacking and they just don't hold up well compared to others like Sikkens.
Click to expand...
Hve used sikkens in the past i thought id give somthing else a go, maybe its the Oil as in Osmo oil that swung it for me on the basis oil and water do not mix
 
Lots of people refer to "Osmo" when they mean Polyx Oil, which is an interior use product. But Osmo, the company, make hundreds of variations.
To guide users onto the right product, they have a selection tool on their website at https://osmorecommends.com/

This suggested WR base coat, followed by Country Shades followed by End Grain Sealing Wax.

What did you use?
 
AndyT said:
What did you use?
Click to expand...
I have to say i went on the Osmo website but not anywhere to the degree of the link you sent me, the product i used is a exterior clear protection certainly not the "extra" nor did i apply a base coat firstly. Looks as i will have to re think my finishes, i have already coated the next window but its not fitted yet so that will need addressing and the one already fitted may have to wait till i can get a access tower to it
Would seam i have shot myself in the foot again:(
 
It's such a complicated range of products, I'm glad I've only used the commonest one! (Polyx Satin).
 
I have used the WR base coat and Osmo UV resistant oil on external work before, it just peels off within a few months and looks terrible. I think this is the case with most “clear” external finishes because the sun bleaches the underlying wood regardless.

I liken an opaque or semi-opaque finish to sunscreen, it keeps the underlying wood from getting burned by the sun, so that it doesn’t shed the finish itself.
 
20251113_195748.jpgHeres a pic of what i used which and im not sure why is in German i think, i have had it for approx 4 years. One thing i did notice is that it took a long time to dry days i think and even then it felt very oily if that makes sense.

I dont believe it to be any different to the next pic i posted which is straight from following the Osma advice link posted in earlier comment.

I will have to follow up another coat when i fit the next window as one coat is already on and swapping over to Sikkens wll not work on top of other manufacturer paints, well so the website said.


20251113_125213.jpg
 
tony.w said:
Heres a pic of what i used which and im not sure why is in German i think, i have had it for approx 4 years. One thing i did notice is that it took a long time to dry days i think and even then it felt very oily if that makes sense.
Click to expand...

It does feel oily afterwards, I've also had times where it's taken over a week to dry, but I put that down to too liberal of a coat.
 
Trevanion said:
I've also had times where it's taken over a week to dry, but I put that down to too liberal of a coat.
Click to expand...
Yes mine to, I will have to give the other window a coat of the same now as it already has one but after that back to sikkens
 
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