Covering can a lot of times be a very frustrating job, especially for the beginner. These tips won't make you a pro overnight, but using them will help make your covering jobs come out looking better than ever.
THE FINISH UNDER THE FINISH
One of the biggest reasons covering comes out looking less than satisfactory
is because of what's underneath it. All that balsa and plywood that makes
up your airplane! In order to allow your covering job to be the best it can
be, you must start by making sure the airframe is sanded as smooth as possible.
First start by sanding with 220 grit sandpaper, with a sanding block, and
take off all of the high spots and excess glue . It is very important that
you use a sanding block because it will keep everything straight and even.
Second, fill in all of the voids, gaps, holes, imperfections, etc. using
your favorite filler material. When this is completely dry, sand the filler
smooth with 220 grit sandpaper and sanding block. This next step is very
important. Sand everything again using 400 grit sandpaper and sanding
block. This will completely smooth out any imperfections, getting rid of
all the sanding marks left behind by the 220 grit paper.
When completed the surface should be very smooth to the touch. It's also a good idea to not only look at your work closely, but to also feel it with your fingers. Run your hands over the surface of the wing or fuse and feel for any irregularities. This will point out anything your eyes missed. The last step before covering is to get rid of all that sanding dust. Use a vacuum or air compressor to blow off the worst of the dust. Right before covering, use a tack cloth to remove the rest. Also make sure the area your covering in is dust free. If not, all the balsa dust lying on your workbench will somehow manage to migrate under your covering just before its applied!