iconoclasterbate t1_jdrsmv3 wrote
You can do both, probably should.
Knock down any peaks with a wall scraper blade or aggressive sanding, then skim coat till smooth. Sanding is messy, wear a mask, cover and tape places you dont want dust and test paint for lead first.
Your walls seem fairly flat, so you might be able to forgo the sanding and mess it creates. I would just give it a once over if so, just so a thick paint bump doesn't add 3 extra coats to your skim job
Either way step one is a TVP wash, cleans oils off, makes surface more porous and ready to paint/mud
Buy mud, mix till yogurt like, so a little more runny than the premixed comes. Add water slowly, cannot remove water. A mixing paddle and drill and 5 gallon bucket works fine
Thick roller on a pole is dipped in and applied to wall
Smooth with a wide trowel. I like the 24" rubber edged ones
Let dry, scrape peaks off, repeat till wall surface is all mud, sand smooth, primer, paint
check wall by shining a bright light against the surface, looking for imperfections in shadow cast
Its laborious and tedious, but not hard. Easier and cheaper than replacing with drywall, but not faster
You'll be proficient after a google search and you finish your first wall. Good luck!
meldy54 OP t1_jdrvz6x wrote
Wow, that was a fantastic write up. I really appreciate that. Fortunately, there really is only 3 large walls that will require this doing it to it. I’m not afraid of the work, so that write up is likely what I will follow. I appreciate it!
imnottrying t1_jds0ffi wrote
Just to add to this, you may want to paint with bin shellac primer to minimize any issues the mud may do to whatever is on the wall. Also, if your doing skim coating first time and want a dead flat finish, I would get the 45 min, 60 minute mud and do the thinnest coats possible. I’m talking less then 1/16” thin or pull it pretty tight so there’s almost barely any on the wall. You can scape any bumps and go again once dried. Skim coating is an art that pros who are good can get away with 2 to 3 coats or less. For people just doing it the first time, do 5 to 10 coats and do a 10 to 12” trowel and put the mud on the trowel, don’t paint it with a roller. It’s much easier to control but will take a lot of time which is why you should do the 60 min as you can go again once dry. You’ll have some divots from the old wall not being flat and parts that are uneven but each time you will fill it in until your last coat is flat and smooth. If you do thicker, you risk having uneven spots like you have. Some people like it but that is why your walls looks that way because folks do 1/4” or more of mud/plaster and then sand high spots but it’s left with larger uneven spots that looks similar to stucco.
meldy54 OP t1_jds1lb6 wrote
That is something I will plan to do as well. Thank you also for the detailed write up. Seems like the thin coats seem to be the way to go as well! Thanks!
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