You know folks on the forum here don't sit around wasting their day trying to answer questions just so they can mislead people. You asked the question and that man with much more knowledge and experience tried to help you.
What's really silly on your part is you've never used it, never even heard of it being used but you have a negative opinion based on ????
Any acrylic sealer will crack if used improperly and as well most of us sell pieces, your not different by any means nor will your products be, but your right you can use anything you want its your money friend or your customers more likely, you can charge more for your work to cover the cost of buying at a hobby shop.