Estes BOSS Kit #7316, Build, Part 8, Prepping The Round Index Dish

On the overlay disk cardstock - 

The hold down tics should be cut, then sanded smooth with 400 grit.

With sandpaper rolled over your finger, 

sand around the burnt edge to remove the brown soot.

I used a glue stick to adhere the cardstock disk to the balsa. Glue sticks allow you to apply an even coat. You do have to work quickly as the glue dries fairly fast.

One of the three kits I was building had some shipping dents in the cardstock.

Earlier, I turned them over and tried to raise and smooth them with a burnisher. 

This helped but I was concerned the slight dents would show up on the finished model.

Some CWF was applied using a single edge razor blade to fill the dents and remove the excess. 

Some smooth sanding followed.