Amazing Clear Cast -- Masking drips

I'm having trouble with drips along the edge of my project.  I have tried masking the edges (with painters tape) to prevent Amazing Clear Cast from flowing onto certain areas and then removing the masking before the Amazing Clear Cast is fully cured -- I still get drips.  When is the appropriate time to remove the masking in order to minimize drips?  Basically, I need it to be soft enough that the masking can be removed without compromising the coating, but it needs to be hard enough that the Amazing Clear Cast no longer "flows", but I don't know how to judge the state of the cure.  Is there a good time approximation for this level of cure?  Are there observational cues that could help me judge that level of cure?

If I am unable to minimize drips to my satisfaction during the pour then I know I can sand them out, but I haven't been able to get a nice shiny polish once sanded.  Could you outline steps to polish to a nice gloss if that is what I end up having to do?