The clear coat may ruin the pastel affect a bit when you cover it up. If you wait until very last to apply the pastel tehn put it on the shelf and keep hands off , it will be fine as it is. Thats the method I use on armor and on a 40's race car I did. You can go to my site on this page to see how the pastels work out .
http://www.lizardsworkshop.50megs.com/69.html