Sawyer Products SP645 Permethrin Premium Insect Repellent for Clothing, Gear & Tents Trigger Spray, 4.5-Ounce, 6 Bottles

Q: is the bottle neck size 28/400 ? if not what is the size.

Not sure but the bottles have no inner seal and leak and no one answers to it when there is an issue.

Q: Can this be used on furniture such as couches or beds?

Yes, Sawyer Permethrin can be used to treat a variety of fabrics. Just be sure to follow the application instructions with sufficient ventilation and allow the treatment to fully dry before use.

Q: Need to buy a trigger spray where can i order

Hardware stores, some supermarkets, any Wal-Mart or K-Mart or Target

Q: Attacked by swarm of biting flies. Sprayed this on car and at them, and body. Does this not bond to metal (car)?

This product is not designed for automobiles or metal surfaces. It’s designed to spray on your clothes before traversing tick country. We. Spray our clothes before riding horses in wooded trails. You probably should use th product as it is designed to be used. It does work well for repelling ticks. We are trying to prevent lymes disease and other tick borne diseases.