A high pigment and binder proportion to solvent will be less health threatening, and have a fuller obliterating effect. The measure of this is the specific gravity of the paint. This is shown in its specification. With the growth of the oil derivatives industry oil based petro vinyl polymers have formed the bulk of paint binders. There are the obvious risks.
Emissions worsening pollution and material is created with no natural re-integration route.
There are changes. Casein, a protein in milk, is being used again. Binders made from soya bean are available, maize is used, gluten, the protein in wheat is used. At the moment, as with solvents, it is the small specialist manufacturers who are using these health safe, eco safe, materials. This will not be so for long.