Captur tyres & tracking

25235 km / 32 months. 4 new tyres
Not very impressive Renault.
The car was also built twisted meaning the rear left tyre scrubs off.
About year ago I swapped front to rear to squeeze more life out of the original Michelin green tyres. I could have got another ~3 months out of the old fronts/current rears, but it's winter.
It seems I am not alone. The place that does my tyres reckons the originals do about 20000km, and after that maybe 15000km. And tracking that's impossible to fix.
It was off from new on the fronts.
Chances of winning against Renault?  

Goop tyre sealant

A rash of punctures on the ride-on had me looking for tyre sealant. There are a bunch of them, all with different uses and differing amounts to inject.
Linseal came highly recommended in a one-product-fits-all. You need a fair amount, and I was quote €160 delivered for 25L, but that might be +vat. It was 15 L too much, and smaller bottles werent economic. Slime (American) comes in tube and tubeless and requires a fair amount. It's pretty expensive and it lasts 2 years according to them.
I found Goop. I paid €34 for 2 litres, which will cover the trailer (no spare), the ride-on and 2 wheel barrows, with a bit to spare. Small tyres need 250ml, the barrow 125ml. I struggled to get much info on dosing, but most applications are shown on the bottle.