I've noticed you also had a posting about future clear, so it seems you are doing the correct steps for prep work.
Never tried this particular brand of wash myself, so did a search on youtube - and the liquid does look thick! There was also a comment left stating these need to be thinned to work better. Here's the kicker, they suggest Testor's acrylic thinner, yet the bottle is labeled that these are enamel washes?
https://www.youtube.com/watch?v=KEc6AEV4Aw4
regards,
Jack