Okay, let's be real-metal putty knives are gonna outlast plastic ones, no question. But that doesn't mean plastic ones are flimsy! Let's break it down. A good metal putty knife? If you take care of it-clean it after use, don't bend it on purpose-it can last for years, even decades. My dad has a metal putty knife that he's had since the 90s, and it still works like new. Metal is tough, it doesn't crack, and it can handle a lot of abuse.
Plastic ones, on the other hand, have a shorter lifespan-but how short depends on how you use 'em. If you're using it for light jobs-like smoothing tape, scraping stickers, or patching small holes-and you clean it right after every use? It can last 2 to 3 years easy. I have a plastic knife that I've had for 2 years, and it's still in great shape.
But if you're using it for heavy jobs-like scraping thick paint or prying apart wood-you'll probably wear it out faster. The blade might crack, or the handle might start to loosen. I went through a plastic knife last year 'cause I used it to scrape old paint off a wooden fence-after a few weeks, the blade was all bent and cracked. Total bummer, but hey, it was only $3.
Here's the thing: Plastic putty knives are cheaper than metal ones, so even if they don't last as long, replacing 'em isn't a big deal. If you're a casual DIYer who only uses a putty knife every few months, a plastic one will last you plenty long. But if you're a pro, or you do a lot of heavy-duty projects? Metal is worth the investment 'cause it'll save you money in the long run. It's all about how much you use it and what you use it for.
