Yes, which was why I had asked that question before proceeding... because I wasn't sure if sealant would seal up punctures in the (usually latex) tubes very well. That makes sense that the Tufos would seal up more like tubeless, although I never liked the ride quality of those. The Rubinos Aardwolf mentioned don't say which type of tube they use (the description is obviously recycled from their clincher tire, mentioning a folding bead), but I suspect they use butyl at that price point.