Good luck with the powder coating, personally I detest it as it doesn't do what it says on the tin. A Plymouth wrought-iron company near Cattedown will only powder coat garden furniture if it is galvanised beforehand so I think that sums it up. As to the tubeless tyres, I am not a professional tyre fitter, I am a retired engineer and I find that a lot of tyre fitters are useless. The talk about the tube walking around the rim is IMHO baloney. Add talcum powder. Incidentally tubeless tyres are supposed to be fitted on safety rims. These are marked H2 for double hump although there are allegedly single hump H1 rims about that only have the safety hump on the outside. Without the hump potholes, roadworks or kerbing can cause the tyre to come off a non-hump rim. If you don't have a humped rim please fit a tube, trust me I'm an engineer. Alternatively keep it pumped up very hard, bear in mind that you are still living dangerously if you do this.

Whilst on the subject of wheels I'd like to mention a good dodge for curing leaky alloys. (1) Don't think that liberal amounts of tyre soap is the answer because it isn't! The real cure has to be done at home. (2) After removing the tyre and valve clean off all the flaking paint and black aluminium oxide and try to get down to shiny metal. The alloy now has to be primed with Special Metals Primer (etching primer). (3) After this has hardened, paint over the primer with "Smoothrite" and allow it to harden for at least a day if it is summer (in winter drying times are much much longer and artificial heat will be needed). OK the painting and drying may take a week but it will be worth it. (Putting paint directly onto alloy won't work properly as it will flake off just like the OEM paint job). As to the tyre, I use manicure clippers to clip off any "bobbles" in the tyre bead area. If the tyre bead has old paint or dirt stuck to it use glass-paper to sand it off. Once the bead looks as if it will make a good seal, soap it and fit it in the normal way (fit the valve first!) Done this way the tyre should stay hard for at least three months. Good luck!