Just had my first puncture where sealant wouldn't 100% seal. Riding on 9W yesterday and was pulling up to a stoplight and noticed speckles of sealant on my rear seat stays so I pulled to the side on a busy intersection and rotated my wheel and added more air. I got about a mile further and stopped again to check if the tire was holding and the tire had bubbles of sealant. I pulled out my Dynaplug kit and pushed in a plug and refilled the air and as of this morning the tire has held completely. Now to be fair this kind of puncture would of 100% killed any kind of tube. Besides having to wash off the sealant, going tubeless and using Dynaplugs was super easy