The blue painters tape is ok to protect the finish and make sure there's no adhesive left behind. I used blue painters tape for the base, and then electrical tape on top of that. I couldn't find my duct tape for some reason... which means I'll have to buy a mega value pack next time I'm at the store
Oh and my rifle got the last laugh. I installed the damn hammer spring backwards so the friggen trigger pin kept walking out on me! Corrected it and now it's all good... but damn I was getting frustrated