I personally would advise spraying it outside and make sure to spray it onto the batting as you need ventalation. AND you risk getting sticky residue on the floors, carpets, walls everywhere. It does hold through out the process. And yes it will wash out. Others will have better knowledge of using it. Just make sure you have lots of ventalation that stuff stinks. LOL. You can also do a search for basting spray lots of postings on it.