Re:
Slime tubes have worked very well for years for me, we get hedges trimmed round my way which leaves great big thorns everywhere. I think it's only 50g extra which is nothing really and better than trying to change a tube when it's cold wet and muddy. Haven't had to fix a puncture in about 8 years! But, it can dry out a bit and can clog up the valve - bit of hot water frees it up again, and if you change a tyre it tends not to seal up again in the previous holes. I run tubeless too and would get that finish line stuff when my stans runs out, I'd put that in tubes too - continental presta tubes have removable valve cores as I put slime into my 29er tubes.