How Long Will Primer Last on My Car
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Discussion Starter · #1 ·
I primed my computer case and everything went smoothly but my question is, if i wait too long to paint my top coat, is that bad? can the primer be too dry? if so, do i have start over by sanding off my primer and spray new primer?
Thanks in advice
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it can get dusty, which would prevent your first coat of paint from sticking well. also, if it sits too long, you will be preventing the primer and paint from bonding together which is why you use primer in the first place.
how long is it going to sit, and where?
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nah ur cool. Just dust it....
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The primer should be fine. Just be sure not to handle it to much as the oils from your skin will get into the primer. On a glossy automotive type finish this would cause fisheyes and other blemishes but on the inside of a case it probably won't be noticeable.
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Discussion Starter · #5 ·
Well the dust stuff and oil. I always wash it with soap and water, blow it with my datavac electric duster, and then i used a tack cloth so that is not an issue.
The primer been sitting in my room for a month lol. i been too lazy to paint the top coat.
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Haven't you ever seen those dirt bags who drive their Trans Am with primer paint around? You're fine
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Discussion Starter · #7 ·
Quote:
Originally Posted by The Master Chief;13805661
Haven't you ever seen those dirt bags who drive their Trans Am with primer paint around? You're fine
well i do all the time but i do not know if they paint a top coat on that eventually. My only worry is that the top coat wont bond with the primer.
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If the case is steel it could be a problem. Primer snarfs up moisture from the atmosphere and causes metals prone to rusting to begin rusting under the primer.
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Discussion Starter · #9 ·
Quote:
Originally Posted by dave12;13805734
If the case is steel it could be a problem. Primer snarfs up moisture from the atmosphere and causes metals prone to rusting to begin rusting under the primer.
so the top coat stops the primer from picking up moisture? so basically I better put a top coat on it soon? because i am 99% sure that the case is steel.
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Just sand and dust it before the finish paint.How long you wait doesn't matter.
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Nope, not bad at all. Just clean it with some windex or if you don't have any available use soap and water then use a wax and grease remover. Trust me, I custom paint cars for a living.
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no you will be perfectly fine just wipe down your case with rubbing alc before you paint it most military fighter jets are painted in flat grey primer and have been doing the same thing since the 40's. primer is pretty tough and durable if you do it right. if you do a crap job of priming the rest will be crappy as well. just keep it clean and dry and you will be fine.
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Quote:
Originally Posted by CartmanTheTub;13805721
well i do all the time but i do not know if they paint a top coat on that eventually. My only worry is that the top coat wont bond with the primer.
You'll be fine. Just give the primer a quick scuff/sand when you're ready to paint the top coat!
Quote:
Originally Posted by dave12;13805734
If the case is steel it could be a problem. Primer snarfs up moisture from the atmosphere and causes metals prone to rusting to begin rusting under the primer.
What are you talking about? Primer stops moisture from getting to metal.
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Quote:
Originally Posted by repo_man;13812072
What are you talking about? Primer stops moisture from getting to metal.![wth.gif]()
No it doesn't unless it's a sealer primer (like that zinser or kiln stuff for drywall or POR15 for metal) and those aren't usually used on metal. You would need an enamel top coat to seal the surface. If he's going for a flat black look he should hit it with a flat or eggshell black enamel or the primer will start snarfing up humidity out of the air and cause oxidation, especially near the rivets if they are a different metal than the case frame.
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Quote:
Originally Posted by dave12;13818187
No it doesn't unless it's a sealer primer (like that zinser or kiln stuff for drywall or POR15 for metal) and those aren't usually used on metal. You would need an enamel top coat to seal the surface. If he's going for a flat black look he should hit it with a flat or eggshell black enamel or the primer will start snarfing up humidity out of the air and cause oxidation, especially near the rivets if they are a different metal than the case frame.
no you dont. all primer for metal stops rust and moisture it has to otherwise it defeats the whole purpose of priming the metal to begin with. for example on air planes (military) they are painted in primer only if they are grey. the reason they do this isnt just to save money it seals and protects the metal by itself better than most paints will. the reason you prime a car before painting it is to seal and protect the metal the only reason you use sealant over the primer is to protect the primer (its not necessary and a waste of money). with fighter jets they use primer to seal the metal and prevent rusting they travel at high speeds in high altitudes were frost and ice forms on the wings. we all know that that is bad for metal. if primer absorbed moisture and caused rusting underneath it the primer would bubble also if it did that wouldn't most fighter jets be rust buckets after a few flights? i highly doubt the military would use something on a billion dollar machine that allows rust to eat away at it. another example ships they are also painted with various primers and they dont rust easily despite being in salt water. i have been working with and painting metal with primer for years and have yet to see signs of rust beneath the paint.
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Quote:
Originally Posted by ELEKTRIK_BLUE;13819444
no you dont. all primer for metal stops rust and moisture it has to otherwise it defeats the whole purpose of priming the metal to begin with. for example on air planes (military) they are painted in primer only if they are grey. the reason they do this isnt just to save money it seals and protects the metal by itself better than most paints will. the reason you prime a car before painting it is to seal and protect the metal the only reason you use sealant over the primer is to protect the primer (its not necessary and a waste of money). with fighter jets they use primer to seal the metal and prevent rusting they travel at high speeds in high altitudes were frost and ice forms on the wings. we all know that that is bad for metal. if primer absorbed moisture and caused rusting underneath it the primer would bubble also if it did that wouldn't most fighter jets be rust buckets after a few flights? i highly doubt the military would use something on a billion dollar machine that allows rust to eat away at it. another example ships they are also painted with various primers and they dont rust easily despite being in salt water. i have been working with and painting metal with primer for years and have yet to see signs of rust beneath the paint.
Flat enamel is not primer. Painting something with a color surface prep agent is not sealing anything. I'm not going to argue this, because I don't know enough about it. I do know that you can go over to Sherwin-Williams and ask them, they know. (Not the chick at the retail counter, ask the guy that handles auto shops.)
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Quote:
Originally Posted by dave12;13820882
Flat enamel is not primer. Painting something with a color surface prep agent is not sealing anything. I'm not going to argue this, because I don't know enough about it. I do know that you can go over to Sherwin-Williams and ask them, they know. (Not the chick at the retail counter, ask the guy that handles auto shops.)
i dont need to ask the guy at Sherwin-Williams who handles auto shops because sherwin-williams doesnt specialize in automotive paint. i work in an auto and motorcycle shop. i do most of the machining and all of the painting. i dont need to argue this fact because it is pointless. i never mentioned flat enamel at all i said primer so stop twisting my words. the freaking can says primer its primer. the part number on the shipping containers matches up with the company's primer part number enough said. im sorry but im gona trust the guys at coast airbrush who do mostly automotive paint to give me the right stuff especially since i went to school with most of them.
SIDE NOTE: im not starting a war over it. im not being disrespectful. so im dropping it and leaving it alone ive made my point if you wish to carry on its all on you bud.
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Primer is, in many cases, over-sold on its sealant properties. Its main function is to provide a surface for paint to solidly adhere. Given enough time the sealant properties attributed to it fade, which is to be expected. This is just a fact of the chemistry. However, given that it has been just a month, go ahead and clean the surface thoroughly then paint your topcoat. I honestly wouldn't bother sanding. If your primer coat was applied thickly enough and evenly enough it will do its job.
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Quote:
Originally Posted by ELEKTRIK_BLUE;13824144
i dont need to ask the guy at Sherwin-Williams who handles auto shops because sherwin-williams doesnt specialize in automotive paint. i work in an auto and motorcycle shop. i do most of the machining and all of the painting. i dont need to argue this fact because it is pointless. i never mentioned flat enamel at all i said primer so stop twisting my words. the freaking can says primer its primer. the part number on the shipping containers matches up with the company's primer part number enough said. im sorry but im gona trust the guys at coast airbrush who do mostly automotive paint to give me the right stuff especially since i went to school with most of them.SIDE NOTE: im not starting a war over it. im not being disrespectful. so im dropping it and leaving it alone ive made my point if you wish to carry on its all on you bud.
This. He's right. How should I know? I spent 7 years painting cars professionally.
Quote:
Originally Posted by Solarin;13852156
Primer is, in many cases, over-sold on its sealant properties. Its main function is to provide a surface for paint to solidly adhere. Given enough time the sealant properties attributed to it fade, which is to be expected. This is just a fact of the chemistry. However, given that it has been just a month, go ahead and clean the surface thoroughly then paint your topcoat. I honestly wouldn't bother sanding. If your primer coat was applied thickly enough and evenly enough it will do its job.
The only thing that would require you to sand that primer off and redo it is if it oxidized or was exposed to sunlight for a long period of time. I will tell you that if you don't sand the primer first (or at least scuff it with a scuff pad) you run the risk of the paint peeling off it later.
Here's my suggestion: Read the can that the primer came out of.
How Long Will Primer Last on My Car
Source: https://www.overclock.net/threads/is-it-bad-to-leave-the-primer-unpainted-for-too-long.1037137/
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