Damn 4 hours and it still ain’t 100% sanded. Crazy
Use this, with 100 grit mesh paper https://imgs.search.brave.com/UTiTLgUs23ZojYcCibMXsF-t8gkKX32Zw0jf4trwkOU/rs:fit:300:177:1/g:ce/aHR0cDovL2VjeC5p/bWFnZXMtYW1hem9u/LmNvbS9pbWFnZXMv/SS80MTNIUEJKV0dD/TC5fU1gzMDBfUUw3/MF8uanBn
and a sponge sander for corners, medium grit. Don't bother with 'fine' anything. ROLL the primer, do not spray. Trust me, I'm old and have done this shit more times than I can count.
I noticed last night if the sand paper / sponge goes weak it stops sanding different patches at the same rate leaving raised patches to become even more raised. Made me think a stronger grit would be better as it seems to need to need decent grit to sand everything equally.
Thanks
Not sure I understand, but you may be over-sanding. Only scrape between coats with a 12" drywall knife, you only need to sand the last coat.
--and NEVER set tape with 20 or 45 mud, it will not bond the tape well. Use the greentop mud or Plus 3. Set up fans everywhere, open the windows, take all water buckets out of the room. Let the fans run all night.
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