Table of Contents
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.
Can you paint directly on Bondo?
A direct application of Bondo Ultimate over sanded or cured primer and paint is possible. After applying this filler, it is easy to sand.
Can you paint right over body filler?
Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. However, with so many different types of aftermarket paint available (lacquer, enamel, urethane, water-based). We recommend that all paint be removed where filler is to be applied.”Nov 3, 2012.
Should Bondo be primed before painting?
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.
What primer do I use over body filler?
Applying body filler over epoxy primer provides maximum corrosion protection for the metal. Apply filler within seven days of applying epoxy primer to maximize adhesion.
What grit sandpaper do I use for Bondo?
First step: Prep the Surface Before applying, paint needs to be sanded to the bare metal. Make sure to sand outside of the repair area as Bondo will need to be spread and applied wider than the damaged area. (36-grit to 220-grit should do the trick for body filler application).
How soon can you paint after Bondo?
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.
Can you use self etching primer over Bondo?
Yes. You can apply self etch over fully cured filler.
Can you paint por15 over body filler?
CAN I USE BODY FILLER OR PUTTY WITH POR-15? Yes. First paint both sides of the rusted area with POR-15; then use body filler or putty as soon as the POR-15 is dry to the touch.
What is epoxy primer?
Epoxy primer refers to a sealer that has a non-porous finish. It is primarily recommended as the first base coat over bare steel. These base coats or epoxy primers can be used over fiberglass, plastic or the black iron phosphate coating as well. This primer can also be used on cracks and dents.
Can you paint over Bondo glazing putty?
It is non-staining, so it won’t affect the color of paint or finishes around the repair area. Use it for filling pinholes in body filler as well as for covering minor sand scratches, and more on metal, fiberglass and wood as well as sanded and primed or sanded and painted surfaces.
What is the difference between Bondo and Bondo wood filler?
The biggest advantage of using Bondo over a regular wood filler is the short dry time. Wood filler can take hours to dry and require more than one coat. Bondo dries in less than 30 minutes and only requires one coat! This means more projects in less time.
How long can Bondo be left unpainted?
Between life and work, the longest time period the bondo would go Unpainted would be about 2-3 weeks.
Does body filler go on bare metal or primer?
For small repairs, you can bog directly over the bare metal. If the repair is larger, or you’re looking for a longer-lasting job, apply a base coat of epoxy primer before laying on the filler.
Can you paint over filler primer?
It is true that Self Etching Primer can be painted over, but you must follow the manufacturer’s instructions and top coat guide closely. As a general rule, Self Etching Primers need another coat of primer over them to fully seal them.
What is the difference between primer surfacer and primer sealer?
A surfacer is used to correct minor surface irregularities and a sealer is used to stop your top coats from being absorbed by a more porous substrate.
What is 2 K primer?
2K is usually thought of as a “filler primer” that is sanded to help level the surface and take out slight imperfections. Epoxy primer is a “direct to metal” primer that can be a little gummy and not as good for block sanding.
How much hardener do you put in Bondo?
Mixing is the most vital step when using body filler. Plastic body filler needs the filler and a hardener mixed at the perfect ratio. The mix is crucial: 50:1.
What comes first primer or Bondo?
The other says primer, then Bondo. Avoid endless forum threads and consult the manufacturer for the definitive answer. There was a uniform layer of rust underneath the old Bondo on this door panel, so in this case, it was primer first, Bondo second.
How long do you let Bondo dry 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.
Does cold weather cure Bondo?
If you’re talking about body filler (bondo) you can use localized heat so that it cures properly. A small heater or heat lamp can keep you going all Winter as long as you’re doing one or two panels at a time.
What is the difference between self etching primer and primer?
Epoxy primer is catalyzed and self etching is solvent based. Self etching primer bonds well to bare metal surfaces and can be top coated in a short period of time. Epoxy primer can be applied in heavy coats which can be guide coated and block sanded to remove small imperfections in the body.
Do you etch primer before filler?
Because it cures quickly, it’s the method of choice for collision shops. But a key difference with etch primer is that you need to apply your filler or bondo first directly to the metal before spraying it.
