Generally, in a matter if a few minutes it will start to harden and get rubbery. This door panel looked reasonable but was, not surprisingly, a giant mess. At that point, you can carve it up with a utility knife, a hand planer or a bondo rasp. Start over. You only want to mix what you can use in about 10 minutes. The goal was to get down to the metal, take a measure, and scuff the repair area back out to 60–80 grit. Bondo is hard to sand once dry. It may take a couple of years at the longest or in the worst case scenarios, I … A palm sander allows you to work edges and finesse the sander to achieve the profile you want. Before using bondo check and see if it has separated at all, and if so, stir it up. The Home Depot near me didn't have the regular "pink-stuff" Bondo, but they did have a version called "Bondo-Glass". The Bondo discovery process rarely goes as planned. This 1-part nitrocellulose putty dispenses easily and efficiently right from the tube with no mixing, affords a 3-minute working time and is sandable in 30 minutes for fast, efficient repairs. How long does bog take to dry? No matter how long the epoxy takes to dry you must allow it to fully cure before you attempt to sand or move it. If you do not adhere to this procedure and the epoxy is not fully cured, … 10 minutes. On average, the epoxy usually takes about 72 hours to cure properly. Start off with 100-grit sandpaper for rough areas, but finish the job with 200-grit paper, otherwise you will scratch the surface. The car is in my garage and it is around 50 degrees here. If your bondo hasn't hardened after a few days, nothing will help it now. When Bondo (or any auto body filler) is used to patch wood, it fails in a very short time. If your filler hardens too fast, you used too much, if it takes too long, you didn’t use enough. Just like caulk is too flexible to effectively fill large gaps in wood, Bondo is too stiff to do the same. I do most all of my fiberglassing in a 70 degree climate-controlled workshop, so temperature isn't that much of an issue. The first thing to consider when determining how long it will take your primer to dry is the formulation of the primer itself. Properly mixed, body filler will begin to thicken in 10-15 minutes, and be fully cured in 30. Bondo® Glazing & Spot Putty is easy to use, dries fast and stays durable, ideal for filling pinholes in body filler and covering auto body scratches, paint chips and minor dings. I put some bondo body filler on my car to fix a dent and am wondering how long it takes to dry because I have to sand it. It was $14.00 for a quart, but the package said it could be used for wood repair if one wanted to. Click to see full answer. There are two main varieties of primer, much like paint. Similarly, it is asked, how long should Bondo cure before sanding? Quick work with a grinder revealed multiple layers of paint, old Bondo, and rust. How long does it take for Bondo to fully cure? Actually, bondo should be pretty darn hard and sandable after 15 minutes and well cured in a day. Before you begin applying Bondo, make sure to sand down the paint, replace any rusted … I don't know much about the Bondo fiberglass, just the body fillers, but I'll guess that there is a shelf life. You can use Bondo to fill in small dings and smooth out warped panels in a car body. How long does it take Bondo body filler to dry? First, you have water-based primers, which are easier to work with and should dry within a maximum of three hours. I thought it was too much of a gap for the wood-putty I have to fill, so I decided to pick up some Bondo. Bondo is an automotive body filler, often used for car and household repairs. Step 3 Sand the Bondo. Curing time is mostly affected by how much hardener you use. 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