I have trouble with trimming soft denture reline materials. Do you have any hints?

Try to capture the reline in a single application. Place petroleum jelly in areas that you do not want the reline material to bond to. Trim flash initially with a sharp scalpel blade. Trimming and finishing points can be used to complete the finishing process. Let the material set for an additional 30 minutes after intraoral setting for easiest trimming.