1. Make sure the area is clear of dirt and dry.
2. Grab the GOOP or Aqua-seal and apply a dab(directly from the tube or your finger) big enough to cover the area and just a little more.
3. Leave as is to dry or apply a small piece of wax paper until dry for a smooth finish.
4. Lick finger clean. j/k
Also for a "fast fix", Loon Outdoors makes "Sun Patch" that comes in a small tube and dries very quickly when exposed to the Sun or artificial U.V. light. This stuff dries in like 5 minutes so make your repair in the shade before exposing to Sunlight,it does dry in cloudy conditions too, but takes a few moments longer.
Also works fine on Gore-Tex type materials.
I took a nasty fall during a trip to the San Juan several years ago and ripped a fairly big hole in my Simms, The 'Sun Patch' worked very well and saved my trip. Needless to say....there is always a tube tucked away in my dry bag just in case.