Yes i have, and the solution would be to use a moulding or wood trim to join the two surfaces together. I have used trim to designate one painted room from another if they have a common wall. It looks better than just a (never ganna be) straight line of two different colors of paint. I am sure it will looke better than anything else.
Sure. Trim it out with wooden corner trim. It covers the outside angle. You can stain it to match the paneling.
There is a type of molding that is made for this specific purpose. The outside edge is either rounded or squared off and on the reverse side there is a cutout where it attaches to the wall. Go to your local home improvement store, like Lowe’s or Home Depot, they have several different styles that should suit your needs.
You really have no choice but to use molding in that case. Wood and drywall don’t join well. You can’t tape and if you just mud without taping, the mud line will ***** as the wood expands and contracts. Use thin decorative quarter rounds molding and you will be much more satisfied.
The simplest method is to use a wood (or vinyl) corner trim, on the edge with the paneling and drywall.
If you dont want the trim ‘inside’ the opening, then you can use a flat trim, like door casing, on the paneling side. You’ll need to use a drywall corner bead, and let it overlap the paneling. Mud the drywall, prime and paint it, then install the flat trim over the exposed corner bead on the panel face. Takes a little more work, hehe.. but works. For the flat trim, you can use base board trim, door casing, window trim, etc.
Ive used both methods over the years myself - its just a matter of how you want it to look when done.
Have Fun