Laura Trovillion wrote:I have a few questions about your project! How much paint did your listed quantities end up making? I will be attempting to make a significant quantity later this spring, and I am trying to figure out quantities.
I'm honestly not sure how many gallons of milk we used. To refresh my memory, I looked at my first post. It looks like 1 gallon of milk filled on cloth diaper that we hung from our tree. I went outside just now and counted the twine (which is still on the tree 1.5 years later). There are 12 ties of twine out there. I think we probably tied some curds on the same string? I'm going to say that we probably used about 15 gallons of skim milk? If I remember correctly, one gallon of milk makes about a 1/2 gallon of curds. With those calculations, it looks like we made about 7 gallons of paint for our den...but that might be a big understatement.
The paint worked about the same as normal paint. I'm pretty sure it took two coats of paint on the drywall, and three coats on the weird blue latex-painted wall.
I am only adding Kaolin clay as a filler and as a "white" pigment for ceilings. The price of pigments is forcing me to be judicious in my color choices!
The kaolin clay really thickens up the paint. It also isn't as strong of a white as calcium carbonate. I would probably mix both together to get a nice white that isn't too thick. You can buy calcium carbonate for quite cheap. This is the stuff we bought:
https://www.amazon.com/Grade-Calcium-Carbonate-Ground-Limestone/dp/B00959XKGI/?tag=pfa12-20
I do think the kaolin clay helped the paint. People make clay paints, and this seemed to have the advantage of that plus the advantage of lime and casein. I almost wonder if our floor paint didn't work as well because we didn't use any kaolin in it.
Did you roll it, brush it or both? I was wondering about how it might work in a paint sprayer, any thoughts?
We both rolled and brushed the paint. If the milk paint was a bit too thick, it made a very opaque paint that didn't drip much. But, it was also hard to paint on the ceiling when it was that thick. A thinner paint was easier to apply, but was a bit drippier.
I was wondering about how it might work in a paint sprayer, any thoughts?
I'll have to ask my husband. I've never worked a paint sprayer, but he has.
You mentioned both vinegar and citric acid to make curds, was one significantly better than the other?
I'd stick with the vinegar. It's more well documented, and the one time we resorted to using citric acid (because we ran out of vinegar), the paint did not work on the floor. Granted, it was the floor, and the floor had all sorts of issues because it was concrete. I would just stick to vinegar to be on the safe side.
Any suggestions on what you would do differently next time?
Buy a bit more pigment than I think we'll need. We ran out of calcium carbonate and it took a long time for more to arrive and that was really frustrating. We also don't have enough left over yellow ochre to be able to easily mix up more milk paint if we need to patch the wall. The place we bought our yellow ochre also stopped that specific shade, so any new batches would likely be a little off. Since you're making just a white paint, this shouldn't be too much of an issue.
I would also buy a paint mixer drill attachment. The coat hanger worked, but it probably wasn't as efficient as something made for the purpose.
Make sure to stir the paint as you use it so that you don't get pigment settling to the bottom. This isn't as important when you're using just one pigment. But, it makes a big impact if you mix two different pigments.