I keep three X-acto handles on my bench with blades in them, and circulate the blades. One is for cutting that needs a sharp blade. That handle gets the new blades fresh from a pack. When I change blades in that handle, the oldest blade goes in my second handle, and that is used for less demanding cutting. When I change blades in that handle, the old blade (the oldest of the three) goes into my third handle. That is used exclusively for seam scraping and other scraping, where I hold the blade at 90 degrees to surface. That usage rapidly dulls blades and ruins them for any task other than scraping. But I don't need to buy one of those more expensive seam scrapers.