Hi Maxie,
By switching to your new method, you will now see what your customs see when they start washing your prints. You not only will see more happy customers, but also see YOUR work hold the test of time, many years down the road. Which will lead to more repeat business.
In my opinion this is the ONLY way to test your garments ! As a business owner you need to know what happens to your prints once they leave you facility.
Any plastisol can be scratched or rubbed off with enough work and pressure..
This process will pay off over time.. Good Job !