- There is no wall stud behind the ends of these two sections of molding. (Otherwise, of course, I would use nails.)
- The surface behind them is painted gypsum wall board.
- The molding on the right is reasonably secure; however, I suspect that if I rely on it to hold the left molding against the wall it will be pulled away from the wall.
More information:
- I can replace the piece of molding on the right to eliminate the gap.
- Both pieces are installed on the same section of flat wall.
- The trim material is MDF.
- I doubt I have the skill the remove the right piece of trim without breaking it. I haven't enough of this material left to replace it.
- Most important: I'm referring to the fact that there's a gap between the wall and the molding on the left but not between the wall and the molding on the right.
Questions:
- Is there an adhesive that would hold the left stick of molding to the painted surface behind it?
- Is there some form of mechanical fastener that would work?
Thanks for your help, including better ideas.
Best Answer
I added some comments to get clarity on the solution, so I'm going to answer with some generic options you could combine or use individually based on your particular solution. These are roughly sorted "best to worst" in terms of my preference for creating the best finished look.
Edited to add, based on your edit above: If you don't want to remove the pieces, there won't be much you can do. Construction adhesive (common brand: Liquid Nails) may hold it down but it will be challenging to get it in there without removing the piece from the wall. Similarly, if you had that piece off, you could put a drywall anchor in the wall, then use a trim screw to hold the piece down. You mentioned the trim is mdf, which doesn't hold fasteners well, so the pocket screw idea is out (although that would require the pieces to be off the wall as well.)
In short: Without removing or replacing the pieces, there may not be much to do other than try your best to hide it with painter's caulk.