I have never used color catchers before.
The first thing I do is test the fabric to see if it will run.
Hot tap water and a clear glass jar, bowl or measuring cup. Dip a corner of the fabric in the hot water and let it steap for a minute + or -. Sometimes you see immediatly that the fabric runs, others take that little bit of time to start to release excess dye. Others don't bleed at all.
If slight bleeding is the result then I would just wash it. If heavier bleeding use whatever product works in the washer to stop the bleeding.
why waste the money on using the product if you don't have to.