Tinks has preservative in it therefore it should stay somewhat stable ( not turn into ammonia) as long as it does not get to warm. If you are not cleaning your container with distilled warm after every hunt ( before adding more scent) then you are comprising the scent ( the ammonia smell builds anddegrades the newly added urine) If the bottle of scent smells like ammonia you arereally just spinning your wheels!
We use freshly collected scents from deer farms and use biodegradable unscented tampons, dip the tampons in the bottle and take the tampons to the stand, After the hunt we throw the urine soaked tampon on the the ground and make a mock scrape- this works really well.
We used only freshly collected deer urine with no preservatives- we get ours from Southern Whitetail Scents- they collect it fresh ship it cold pack to our home. We have killed some good bucks using this method in the last two years.
www.southernwhitetailscents.com