Caulk or not to caulk?

[Ratty80]

What's the best filler to use around the edge of a upvc window where the pcv window meets the wooden frame? I used caulk a few of years ago but have just spent a long time cleaning the upvc frame and scraping off all the caulk which had turned yellow. Is it better to use a bigger bead? Could I mask the window then caulk around the edge ensuring all the caulk is painted so it doesn't turn yellow.
Thanks in advance for any help

 

[xr4x4]

Caulk is designed to be painted over, isn't true white and yellows.

Use white silicone.

 

[Greavsy]

I always use masking tape, if I'm using Caulk or Silicone. I find it leaves a much neater edge.