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Buying waxed or unwaxed resin is one of those little details that can mess up the beginner. Carbon dioxide inhibits the cure of the esters, so sometimes we use some wax that floats to the surface to seal it off. This has to be cleaned off before anything else gets bonded on - one reason for the popularity of sanding. However, using unwaxed resin is real handy for adding layers gradually, and avoiding heat build-up and distortion on thick parts.
You can stock only unwaxed resin, and either add wax or just use plastic wrap, which can also help improve the surface, reducing finishing work.
When doing spot repairs, you can use a very quick "hot" mix, but eventually, the catalyst defeats itself if you use too much. It makes the dust toxic, too.
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