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Old 06-11-2019, 05:34 PM   #1 (permalink)
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Default Suggestions for siding and painting undercarriage pieces.

So while I have the motor out I want to sand and paint the 3 pieces I have removed from the undercarriage of the engine bay as well as the black piece by the firewall that the control arms bolt onto.

Has anyone done this and what grits of sandpaper and paint would you suggest?

I am guessing just something light to rough up the paint with and then maybe 3-5 fresh coats of spray paint.
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Old 06-12-2019, 07:40 AM   #2 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

I would use this stuff, https://www.summitracing.com/search/...oview=SKU&ar=1 It goes on thick with a brush, prep is fairly easy - and gives a very durable near powdercoat like coating on the parts - Looks great when dry.

You can slap the stuff right over top of rust if necessary, but if you really want a good finish, it's best to sand and prep it.

for parts like those, I typically just clean them really well - hit any flaking paint/rust with a wire brush on a drill, then wet sand it thoroughly with 220 grit, if you really want to take it a step further finish it with 500 grit sand paper or so.
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Old 06-12-2019, 09:15 AM   #3 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

Any undercarriage stuff you pull you can scrub with water/dawn and a stiff bristled brush. If there are any rust spots I normally use an angle grinder with wire wheel disk to clean up. If they were real rusty you could sandblast the parts, or let them soak for a few days in a tub of apple cider vinegar.

When it comes to paint, I like rustoleum professional primer and rustoleum professional semi-flat. That's what I used on my subframe. If anything needs undercoating I like to use 3m professional undercoating. It tends to have a more satin finish. Some of the other undercoats like duplicolor will be a flat black or even brownish which I don't like.




I've never had any luck with por15 going over rust... even using their blue prep stuff. The rust will bubble under the paint and then eventually chip off leaving it almost worst than before. For stuff that is too far gone, or more of a daily driver I'll use NH Oil. It's like a black fluid film so it protects and makes it look good. This is my truck.

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Old 06-12-2019, 10:26 AM   #4 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

I'm with you, I don't think you should ever put anything over rust, because it will just find a way to continue to rust anyways and end up flaking off, but POR says you "Can"

really any rust found should be completely removed, otherwise it will just spread again - usually a wire brush will scrub enough of it away, and then throw a rust converter over top of it - or cut it out.
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Old 06-12-2019, 10:58 AM   #5 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

I used corroseal on the underside of my F150 several years ago and it seems to be holding up just fine. A gallon should be plenty. Basically I went to town with a wire brush to remove as much surface rust as I could and then put it on with a paint brush.
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Old 06-12-2019, 12:48 PM   #6 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

It sounds like he is just talking about the subframe pieces?

If you want the BEST durability, have all the pieces powdercoated by bringing them somewhere locally. They will sand blast them (to clean) and put a durable finish paint on them that is better than anything you can get in a can.

If you want the paint your doing yourself to have it's best chance to stick, here is the prep I normally do. These steps are just as, if not more important, than the can of paint that you choose to use:

Wash the piece really well with dish soap or something that will help cut through grease and oil, get all crud and residue off. Rinse it very well (and scrub without soap to get all detergent off)

Wire wheel every spot I can

Sand it with 320grit as this is what most paint prep directions say

Wash it again, soap+water, then rinse excessively while rubbing with clean rag that has not had any soap on it

Dry it

Rub it down with rubbing alcohol or a "paint prep" product

Wait until it is bone dry (I waited a full day for my rear subframe lol)

Paint it per the can's directions, 3-5 coats typically. First coat light, medium coats thereafter
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Old 06-12-2019, 05:25 PM   #7 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

powder coating is the best durability, "exhaust" rated spray paints are good too for durability. Most spray paints are easily scratched, or easily wiped off with solvent if you are doing a cleanup, so that is the bad part about spray paints. I had some exhaust spray paint that would not wipe off with lacquer thinner, tough stuff but can be scratched.
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Old 06-12-2019, 05:36 PM   #8 (permalink)
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Default Re: Suggestions for siding and painting undercarriage pieces.

Basically just as about everyone is saying but I use a moisturizer barrier similar to por15 but summit racing brand then powdercoat or undercoat to liking. Wire wheel or sandblast is best. I soaked everything in dawn platinum dish soda to help breakdown dirt and grease build up from the years.
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