Costco Gas Hours. On weekdays (Monday to Friday) Costco gas hours is 6 AM to 9 PM . On Weekends (Saturday and Sunday) Costco gas open 1 hour late and close 1 or 2 hours before their usual timings and its timing is 7 AM to 8 PM on Saturday and 7 AM to 7 PM on Sunday. Costco Gas stations are normally closed on some national holiday and religious holiday.
1 BPA does indeed form in the mouth after some dental sealants and fillings are applied. BPA can be found in the saliva three hours after dental work is completed. It's not at all clear whether this poses a health risk.  A quick wipe and rinse of the completed dental work vastly decreases whatever risk there might be.
Calling silicone a sealant is something of a misrepresentation. It is more accurate to characterize it as a gasket material. If you accept silicone's adhesive abilities as temporary, you will find it is the best product for a number of sealing requirements. It is the only one of the marine sealant trio than can be safely used to bed plastic.