How to Fit Skirting Board in a Curved Bay Window
If you have a bay window in your home then fitting a skirting board around it can be a real pain. I have fitted plenty of these in my time as a professional joiner, so let me pass the method that works best for me onto you.
The method I use involves screwing some wooden batons into the floor to help to bend the skirting into place. If the time is available I will leave it like this for a few days before glueing it to the wall.

What Skirting to Use
MDF is easier to get into shape like this than pine would be. Also the thinner the MDF the easier it will be to bend.
So go for a thin, MDF skirting board. You don’t have to cut it down to size before fitting, we can do this once it is in place.
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Where to Place The Wooden Supports
The ideal place to put these wooden supports is wherever the skirting is coming away from the wall the most. You can add as many of these as you like to help to bend the skirting into place.
You will find that once you get it into shape in one area it may have come out in another. This is where you definitely want another support to ensure it can’t move and has to form to the shape of the wall.

How to Fix to the Wall
Like I said earlier, I like to leave the skirting board like this for a few days before thinking about fixing to the wall.
This is not always possible but it does reduce the chances of the skirting simply popping off the wall and not sticking.
I just use a grip adhesive, I have tried a few of them and most do the same thing. I usually use Gripfill or Pinkgrip, both do the same job and I have had good and bad experiences with both, just use whichever works for you.
Leave the wood supports in for as long as possible after glueing the skirting to the wall. This will ensure it has time to fully cure before the support is taken away.
What to do About the Gaps?
So you will undoubtedly have gaps along the top of the skirting. Unless the wall is absolutely perfectly flat, which it never is, you will have gaps.

I would recommend coming back with some decorators caulk once the skirting is on the wall and fill the gaps.
Once you have done that the gaps will be hardly noticeable and will just look like part of the skirting, nice and neat.