Razz pull yourself together. Nobody uses tubes. Tubeless has no issues. It works perfectly every time! Yes, carry a plug kit. Yes, carry a spare tube. Yes, carry some patches if you like. If you have tubeless compatible tires and rims, you should not expect the tire to constantly lose air. Tubeless compatible means that the rim and tires are designed to interface together to seal properly. You may notice tires with sort of "gummy" edges. The tires that are tubeless compatible will not seep quite as much as tires that are not specifically tubeless compatible. Sealant will eventually seal all the places where air could escape. Remember that tires and not completely airtight, so you might see sealant on the tire, on the sidewalls where the tire is thinnest. This is normal. The outside of the tires can often look wet. This is a good indicator that the sealant is viable. Yes, the sealant needs to be replaced in a certain amount of time. A big volume 29" tires may have 90-120 ml of sealant. You can hold up the rim and shake it and hear sealant splashing around. If you don't hear it, the sealant may be non-viable (dried up). It depends on the climate, mostly. I lived in a desert once and the sealant needed to be checked every 3 months to be safe. Yes, you can go back to tubes. But you would have to remove the valves, normally with just a knurled nut. I haven't had the sealant clog a pressure gauge and I check my pressures quite often. The beauty of tubeless is in low pressures which have great traction. I run 20 psi front and 24 psi rear on 29" 2.6" tires. I might go down to 18 front and up to 25 rear. Enjoy tubeless. Other than ripping the sidewall on lighter weight tires I don't get flats with a tubeless setup. I'm surprised the bike shop let you leave the shop with tubes. Nobody runs tubes on an MTB anymore, at least not where I live.
