@indemnifyme - It was nice of your stepfather to help you with that. I discovered what washcoat was in a slightly less pleasant way.
I decided I was going to take on some home improvement projects, including staining a bench for my front porch. Now, I don't know how to stain to save my life. But instead of looking online and getting directions for how to stain properly, I just threw some stain on it and thought that would be fine.
Not so. The bench look terrible! I couldn't figure out what I had done wrong until a friend came over one day and commented that I must have used sealer that was too diluted. After seeing my blank look my friend explained to me what sealer and washcoat was. My next household wood staining project was much more successful!