When to use 2k Primer and Epoxy Primer: Autobody Q&A (2024)

by Tony

Thanks for streaming with us today!✌️ Check out theLearnAutoBodyAndPaint VIP Programto learn more about DIY auto body work and paint. The #BossPainter is back with another auto body Q&A session! Today’s focus question is When to use 2k Primer and Epoxy Primer.

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“I sanded a car down to bare metal. Got busy and put her in the garage. Now 6 months later, she is rusting. Anything easy I can do before primer or re-sand?”

Alright, re-sand it and then prime it. And then, you could put an epoxy primer on it, to seal it up, and then you can put a 2k filler primer on top of that. After that week later or actually the next day if you want.

“Going to be changing a dark navy TDI Jetta to a lighter blue with a metal flake (base/clear). should I: (a) sand to metal and start from scratch or (b) light scuff and epoxy prime and go from there?”

It depends if this is like a super sentimental build and you want to go from the ground up and take it down to bare metal, you could. I think that’s a little extreme in my opinion.

I would go with B, light scuff. You could prep it with you, it doesn’t light scuff. You’re gonna scuff it down a little bit more than a light scuff. Go with like a medium scuff if that makes sense, basically sand it down with like a 220 or 240 grit sandpaper.

I know that it may sound a little rough. But if you’re going to prime it, prime the whole thing which I recommend because it’ll give you a good paint foundation.

AndI would use a 2k filler primer instead of an epoxy. I don’t think you got to go to epoxy if you’re going to go down a bare metal.

You should go with epoxy, but if you’re going to be 240 grit, all of your paint, then I would put two medium to heavy coats of 2k filler primer on it and block it down with 400 grit sandpaper. That’ll be the perfect foundation for you to put your base coat clear coat on top of.

If you want to go a step further, to make sure this job is going to come out fantastic, and although it will if you painted directly over a 2k filler primer as a foundation.

You could spray a sealer only on top of that before you spray your base coat clear coat. So say your 2k filler primer is sanded down, blocked out. Glaze some rock chips or whatever, it’s all ready to go looks good.

You could spray a sealer right on top of it, the day you’re painting. You could just put an all-around sealer on it, seal it, then you can spray your base coat clear coat on top of it. That’s if you want to go the extra mile, but you don’t have to. You’re gonna save a couple of hundred bucks if you don’t, so just an option. Hopefully, that helps.

When to use 2k Primer and Epoxy Primer: Autobody Q&A (1)
When to use 2k Primer and Epoxy Primer: Autobody Q&A (2)

“Sealer may give orange peel?”

That’s true, sealer could give you a little bit of texture on it. So that’s why I personally don’t really like to spray sealers that much.

It’s not necessary if you have a good 2k fille primer slash sealer foundation. Because if you reduce 2k filler primer its pretty much acts as a sealer. And on some brands, it’ll tell you if you want to use that as a sealer. Add like 10 more reducers to thin it out, basically, you’re just gonna thin it out a little bit.

If you guys are interested in getting awesome spray guns, check out Zoolaa.com including the Atom series, and for all newbies who haven’t got any training yet or anything, feel free to hit up LearnAutoBodyandPaint.com.

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Other Helpful Links:

Primers Explained: 2k Urethane Primer, Epoxy Primer and Polyester Filler Primer Uses

Should YOU Apply Body Filler Directly Over Metal or Epoxy Primer?

When to use 2k Primer and Epoxy Primer: Autobody Q&A (2024)

FAQs

When to use 2k Primer and Epoxy Primer: Autobody Q&A? ›

Now let the vehicle set overnight. The next day you can start spraying the 2K primer over the epoxy.

Can you put 2K primer over epoxy primer? ›

Now let the vehicle set overnight. The next day you can start spraying the 2K primer over the epoxy.

Is 2K urethane primer the same as epoxy primer? ›

In general, urethane primers are not as moisture tolerant as epoxy primers so the substrate must be dry prior to application. The exact limit is determined by the manufacturer. The cure time of urethane primers is often much faster than epoxy primers and have a slightly lower temperature minimum for application.

When should you use epoxy primer? ›

Simply put, epoxy is the best primer for bare metal, making it excellent for newly fabricated metal parts or ones that have been fully stripped. 2. Mixed Surfaces – Some primers and coatings need the entire surface to be uniform and all the same material.

What is 2K primer good for? ›

2K Advantages

This allows crosslinking between the two parts for enhanced durability of the coating. These systems are a good choice for field applications where a higher degree of chemical resistance is required.

How long to let 2K epoxy primer dry before painting? ›

This is why, on top of the initial 24 hours needed for drying time, you may need to wait another 24 to 48 hours for the primer to fully cure before you paint over it. Fortunately, you can speed up the curing process with the help of heating methods.

Can I use 2K thinner with epoxy primer? ›

With this 2K epoxy primer thinner you can spray the primer tighter so you get a professional result. When you start mixing this thinner through the 2K epoxy primer you increase the quality of the primer!

Can you paint straight over epoxy primer? ›

Yes, you can apply a urethane single-stage topcoat directly over scuffed or sanded SPI epoxy primer for your Nomad Liftgate.

What is the best primer to use over urethane? ›

Applying a primer to your polyurethane finish is essential. Other types of primers are less compatible with the polyurethane finish, which leaves you with an oil-based primer for the best results. An oil-based primer is the only type of primer that is compatible with your polyurethane finish.

How do you prep a surface for 2K epoxy primer? ›

Remove all loose and flaky material. Degrease the surface using U-POL System 20 Solvent Based Degreaser (UP2012/ UP2022) or Water Based Degreaser (UP2002) to remove dirt and any surface contaminants. Sand the surface with grit P80 to P180. Degrease again and dry thoroughly.

What is the best primer for automotive? ›

Epoxy Primer - Epoxy primer is considered a good standard base when it comes to ensuring the auto paint bonds to the metal and promotes a quality paint finish. It's formulated specifically to prevent corrosion, so epoxy primer for cars won't sand as well as other types, like urethane primer.

Do you sand between coats of epoxy primer? ›

As to sanding between coats I'm an artist and the epoxy I use recommends waiting two days before sanding to be sure it is set enough. I use a 320 paper just to give the surface a 'tooth' and then pour an additional coat.

Can you brush on 2K epoxy primer? ›

Substrate preparation : Clean, dry, free of dust, rust, oil and grease. Sand and clean with any solvent based degreaser / panel wipe. Application process : Mipa EP-Primer-Filler can be applied through brushing, rolling or spraying (Air/Airless)

Can I paint directly over 2K primer? ›

(Q) Do I have to sand the 2K Urethane Primer Surfacer? (A) While this primer is super easy to sand smooth, you may shoot the Single-Stage Urethane Paint over it in a "wet on wet" application. That means the paint may be applied over fresh primer that has still not cured.

How many coats of 2K primer do I need? ›

Apply a cover coat and leave for 10 - 15 minutes depending on weather conditions, then apply a second coat, you may need to apply a third coat depending on your spray gun set up.

What primer to use over epoxy? ›

Latex primers especially performed well when applied over cured epoxy, even when the epoxy was marginally prepared prior to painting (Epoxyworks 7, Spring 1996).

Can you paint over epoxy primers? ›

That's true even if the panel is stored in a damp atmosphere, including outdoors. In addition to the non-porous qualities of epoxy primer paint, it also offers excellent adhesion to bare metal and existing paint. Filler can also be applied onto epoxy primer, sanded and repainted in the regular way.

Can I fill over epoxy primer? ›

You can do it either way. The reason for filling over the epoxy us fillers can absorb moisture so you seal off the panel so it doesn't cause rust problems later.

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