I usually apply the kicker with a toothpick or bamboo skewer rather than spraying. Five-minute epoxy also works when you need added strength or a longer work time. Puttys and seam filling Almost any putty that you normally use on plastic kits will work on resin. Automotive Glazing and Spotting Putty is good for minor imperfections such as pinholes. This putty drys quickly, is very easy to sand and a tube will last forever.
Epoxy putty is great for larger gaps.
It is a two part system that, when kneeded together, can be worked like clay. You generally have a couple of hours to work it before it sets up. The biggest advantage this has over other fillers is that it can be worked and smoothed with tools and brushes dipped in water to produce a finish that will require very little sanding. An excellent one is made by MagicSculp.