A cheap, flexible knife is probably OK for a small or one-time job, but with repeated use, it can bend without resuming its original shape. Quality materials make for a quality tool. “Carbon steel is great for many hand tools,” Talbot explains, “because it can be hardened to various degrees of rigidity, but there’s a problem—it rusts. The next step up, quality-wise, is stainless steel, which will cost more but won't pose the same issue.” Because both types of steel are useful, Hyde Tools developed a superior combination of Rockwell steel and high-quality carbon to produce knives that have a degree of flexibility yet do not rust. This high-grade steel is featured in their SuperFlexx line of putty knives and taping knives. The next time you’re shopping for a rustproof and durable, yet flexible, putty knife or taping knife, consider the superior steel in HYDE’s SuperFlexx line. Your new knife will hold up under pressure and won’t corrode if you accidentally leave it out in the rain or snow.