Mikepier wrote in news:1194012703.014077.88380
@z9g2000hsf.googlegroups.com:

I recently gutted out my kitchen and took down a wall next to a dining
room, where there was 3/8" sheetrock on the ceiling. I did not want to
put 3/8" sheetrock on the ceiling in the new kitchen due to concerns
on sagging, and plus I wanted to use 12 foot boards, so 1/2" sheetrock
was the choice. I tried my best to spackle where the 2 meet ( 4 times
already) it still seems its noticeable, although each time I do it it
seems to get better. What is the best way to spackle the joints?


As mentioned, shimming sounds promising.

If it's in the "right place", a piece of nicely profiled wider trim. Rip it
on a saw 1/8 deep lengthwise on the backside for half the width.