I made a beaut. Christmas runner in the same colors you used. I finally decided to wash it after using it 2 yrs. Big mistake not to prewash. The red bled into the white & now all white is pink. I didn't know about the color catchers yet.
Then I did prewash many 1/4 yd. pieces of fabrics for a Bargello. I even put them in a mesh bag. Another BIG mistake. They twisted into such a massive knot & shreds I had to throw them all away. Couldn't begin to untangle the mess. I had to go buy all new fabrics that did NOT get prewashed. Now I'd be afraid to ever wash the finished quilt without getting the products you've all talked about. This quilt was far too much work to risk it. It may never get washed. LOL
Pat