Use a cardboard template the size of your actual curve. (I use cereal box cardboard). Put a dot of glue where you want to stick the fabric. Press with a hot iron and it will dry the glue. When done, let it rest for five minutes, then remove the cardboard and press again. You may need to clip the curve here and there to remove bulk before setting the glue. This is how I've done it and it worked great!! The shiny covering on the cereal box will not let the glue stick permanently, so you'll be able to pull the cardboard right out to press for the final rounded edge.