Do you need primer over Bondo?
You should use a “direct to metal” (DTM) primer to help top coats stick to the metal but it’s not needed under body filler most of the time. Once the metal is primed then you can apply a “filler primer” (2K) to help hide scratches and minor surface irregularities.
Which sandpaper is needed for a Bondo job on car?
80 grit sandpaper is the most common for shaping body filler.
What grit sandpaper do I use for Bondo?
Use 60 to 80 grit paper to sand down below rust, deeper scars or to sand down and begin to shape body filler, such as bondo. These are very coarse grits and should only be used in specific areas where you really need it since it will leave sanding marks.
Is Bondo bad for your car?
Unfortunately, filling compounds such as Bondo also present some drawbacks. Fillers like Bondo can crack if they are mixed too thickly, harming rather than improving the look of the car. Additionally, there’s a risk of discoloration and poor long-term wear when you use a dent repair filler like Bondo.
Should bondo be applied to bare metal?
Do not slap Bondo onto a smooth painted surface, it is not going to stick very well. The paint should be sanded off, to the bare metal, and then apply the filler. A 36-grit to 180-grit surface is ideal for body filler application so that the filler has a good rough surface to grip.
How long should bondo dry before painting?
Bondo mixed to the color swatch will begin to cure in less than 10 minutes at room temperature. Too much hardener in a warm environment will reduce working time, but too little in a cool environment can result in maddeningly long curing times. A heat lamp can speed curing in colder weather. 4.
How big of a dent can you fill with Bondo?
1/4”
There is no minimum thickness for Bondo, but there is absolutely a maximum. You do not want to apply body filler to anything that is thicker than about a 1/4”. That does not mean it can’t be done, but the repair will not last as long. Eventually the filler will shrink and possibly crack, or even pop off!
How long should Bondo cure before sanding?
Allow the putty to dry 15 minutes at 77 degrees F (25 degrees C). In cooler climates, putty may take 20-30 minutes to dry. 7. Using 3M™ Sandpaper 80 grit, sand and shape the filled area to the contour of the surface.
What is the best body filler?
The best body filler is the 3M Bondo 261, which is designed specifically for automotive usage and cures in minutes ready for sanding. Body filler is often referred to as “Bondo” and when used properly, it can make bodywork repairs straightforward.
What is Bondo body filler?
Bondo (putty) Bondo putty is an automotive body filler and a brand name used by 3M for a line of American-made products for automotive, marine and household repairs.
What is Bondo glue?
Bondo® Self Adhesive Body Patch provides a firm, metal reinforced contour foundation for Bondo® Body Filler and Fiberglass Resins when applied directly over the patched area.
How does Bondo work?
Bondo is a polyester resin product that when mixed with a hardener (an organic peroxide) or catalyst, turns into a putty-like filler that then chemically cures and becomes rock hard. Its claim to fame is that a user can apply the creamy concoction of mixed Bondo to a dented automotive panel,…