What is it that is warping? A piece of furniture? Posting a picture would help illustrate the problem.
Take a read through of this and see if you can apply any of the tips that may have caused the warping:
Has the wood warped because you added chalk paint?
It's unusual for wood to warp from paint. If you were painting particle board, it's possible that the material that it's made of swelled. The way to prevent this is to use a good primer first.
Hello. Can you post a picture to better see your situation and what kind of project you’ve experienced this problem on. Also what product did you use? More information might be able to help us answer your question to your satisfaction.
Hi Doreen, what type of paint did you use? (brand) It is very unusual for wood to warp from the paint. If it was Annie Sloan Chalk Paint it should not have affected the wood in any way. If you used a brand like Rustoleum or one of the other "chalk" style paints those are actually all latex paint with chalk added. They will have a different affect on the wood. If you can let me know what brand you used, I am happy to help.
Here's a post that might help - https://jackieanneblog.com/2019/03/02/top-problems-with-chalk-paint-how-to-fix-them/
Do you have peeling veneer underneath the paint Doreen? If so, Here is one of my Hometalk posts that might help you:
And for more details....here is my blogpost:
Doreen: maybe this will help
Hi Doreen, this may help, you will have to redo it.
These two videos may help: https://www.youtube.com/watch?v=KuXkAe_njEg
Can you answer the questions asked so we know if your problem was answered or not. No one is sure why your project got warped or is that the correct word for what happened.
Hi! Did it peel or lift from the surface? 99% of the time, if it didn't adhere well, the prep on the piece wasn't enough. A good prep makes any product application adhere better and last longer. A few more details and maybe a picture would help!🙂
Do you mean how do you prevent furiture painted with chalk paint not warp?
Sounds as if the plywood was not thick enough or the veneer has lifted. Sounds harsh, but I think you will have to start again unless you can inject some sort of glue under the surface into the void beneath the finish and then place heavy weights over the areas. Sorry can't be more positive.