Occasionally gels are called "shellac," but the two aren’t essentially interchangeable. Shellac can be a trademark of CND, the creators of gel technology. Imagine it a little bit like “jacuzzi” and “scorching tub,” the previous referring to a trademark manufacturer name as well as latter to the form of merchandise. https://bookmarkvids.com/story19268096/examine-this-report-on-steam-nail-gel-remover-machine