As long as you have applied it as you should in thin even coats and are using the shellac full hand lamp then no it will not slide or run as the new lamp has bulbs positioned at the sides to cure the thumbs.
If you are using the brisa lamp then you have to do the thumbs seperately.
For more answers to shellac quetions please visit the shellac lovers group as everything is there, we dont need the main forums to be clogged up again with shellac questions that have already been answered.
Please check there first.
Hths
Jen xxxx
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