Elmer's Glue is probably going to be your cheapest Floetrol substitute option, other than water. If you dilute your glue with a little bit of water, you will get a similar pouring consistency as Floetrol. Your painting will dry to a matte finish when using Elmer's Glue-all (very similarly to Floetrol).
Thereof, has Floetrol been discontinued?
Flood Floetrol Latex Paint Additive-discontinued.
Beside above, what is Floetrol used for in acrylic pouring? By improving both flow and leveling, Floetrol makes paint easier to work with. You can get those large cells more easily, even without an additional additive like silicone. And by improving flow, it makes pouring that much more interesting. Flow improvement also helps the paint adhere to canvas more readily.
Then, can I use Floetrol with acrylic paint?
An excellent way is to follow official instructions and mix 1 part of Floetrol to 2 parts of acrylic paint. The best ratio for your needs depends on the paint you use, the paint consistency you want, and your experience. There are also some recipes with silicone and water.
Does Floetrol thin paint?
 Floetrol is a conditioner which means it enhances the qualities of the water based paint your using while also helping it to be thinner for easier application.  By not just thinning the paint you will achieve better performance out of your paint when it is applied.
