Just a little bit. And be sure to SOAK it with resin, so it gets to the other side.
Also, do not brush. Dab. You brush resin onto the cardstock, but do not brush it onto the matting. If you have sponge brushes, they work great, for about 5 minutes before they fall apart. So get A LOT of those.
yup, this right here, I buy glue sticks like 50 at a time. Because I go through them so fast though admittedly, since I do my stuff out of cardboard, I have to glue patterns down to the cardboard, and glue the fiberglass in place before soak it in resin. so i go through a hell of a lot of glue sticks.