I'm currently skim coating some really bad looking walls and my 45 minute joint compound is setting too fast for me to get a nice finish.

Can I mix the remainder of my 45 minute Joint Compound with a new bag of 210 minute JC to get something in-between?

1 Answer 1


The short answer is yes. I have done this but not for the reasons you have stated. I just had some leftovers and wanted to use them. As long as your mixing agent - water - is the same then mix away. Note that other than trial and error you are looking at a setting time between 45 mins to 210 mins - even if you mixed 50/50.

  • Great, thanks! I am mixing also because I have leftovers, but I was hoping for a slightly shorter drying time as well.
    – Alex Moore
    Commented Apr 16, 2013 at 17:27
  • There are 'kickers' and retarders for the 'hot' JC dry mixes. You have to go to a drywall supplies to find them.
    – HerrBag
    Commented Apr 16, 2013 at 22:25

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.