You'd think right. Then you'd be wrong. The issue with all sprayers is seals moreso than materials. If its just you in your life, it may be OK but you have to research what you are spraying and the product's compatibility to your seal material. And use case. I got super tired of shitty spray bottles for carpet cleaner and I researched which spray bottles would handle boiling bleach upside down and my searches led me to industrial/scientific supplies and I got 2 of these janks: https://www.dynalon.com/PublicStore/product/Flip-Spray-Bottle,489,258.aspx Now they are redonk expensive and I only have 2 years of run time in them with carpet cleaner (damn cats and dogs) but they 0% leak and 100% spray and empty the bottle to 99%. I refill with Bissell carpet solution manually and no other uses, so I can't vouch for other chemical use.

These are NOT cheap and hard to find, but these are not amazon specials but purpose built lab units for chemicals.