Seems like paint removal ought to be a simple concept, right? But how much paint do you remove to remove half of the paint? How do you sample an area to show that you left 75% of a coating?
Can you remove all of a top coating and leave all of the tightly adherent base coat? Are elastomeric coatings tightly adherent by abrasive blasting standards and easily removed by wet blasting?
The advantage of waste streams that contain only the original coating: Dams and tidal structures.
Paint removal that creates opportunity for corrosion. Brushing and scraping.