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Removing spray can paint from engine compartment

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BU1 View Drop Down
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    Posted: Nov/08/2019 at 4:01pm
 Previous owner sprayed rattle can grey primer and then semi gloss black in engine compartment. Any tips to remove it without taking it back to bare metal? Do I dare do thorough surface prep and spray my body color over the rattle can paint? Thanks for any help. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote target Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 4:16pm
Depends on the raffle can. Sem and Martin Senour both make primers that are compatible with auto paint. Probably other pro paints as well. Problem can be lifting, crazing, and other maladies. Base may go on ok if base coat clear coat but react to the clear. I'd be more concerned about how the metal was prepped. If epoxy was sprayed on it if bare metal. And adhesion. If you are willing to gamble do a small area and see what it does. With the work involved to do it over if it was questionable I'd strip it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ralph G. Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 4:41pm
Try brake cleaner first. If that fails then try carb cleaner. Test in an inconspicuous area.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbad69 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 4:49pm
If you're lucky, they didn't properly prep before spraying.. A pressure washer might be all you need to peel the new paint off. You'll want to clean the engine compartment of the caked on grease anyway, so it won't be a waste of time if it doesn't remove the paint
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 5:30pm
 I should elaborate a bit more. There is no grease and grime to clean. Previous owner started a "project", and ran out of desire to see it through. Rattle can paint is over factory paint. Never got engine installed. How many times have we heard this story? Unhappy I am afraid there will be no easy way out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mmaher94087 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 7:07pm
As stated, start by pressure washing.  A heat gun might cause the rattle can paint to sluff off the factory paint.  What ever you do, start with the least aggressive and work to the hot stuff.  Paint stripper or walnut blasting are your last choices.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 7:19pm
My uncle had his van stolen.  The thieves rattle canned the entire exterior black.  The police recovered it and returned it to him.  He was able to remove about 90% of the black paint with fine (like 1000 grit or finer) sandpaper and LOTS of water.

Bob
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pacerman Quote  Post ReplyReply Direct Link To This Post Posted: Nov/08/2019 at 9:26pm
Try lacquer thinner and Goof Off too.  If it was spray lacquer (not likely but possible) you are on easy street.   Joe
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: Nov/09/2019 at 4:27am
I have been successful with Lacquer Thinner before........I have also use Brake Fluid, but takes a lot of patients and time.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Nov/09/2019 at 10:11am
Brake fluid will work too good,  it'll take off factory baked enamel if it sets on the paint very long.

There are some rattle can primers I'd trust,  but I've never seen a single component rattle can paint that i'd trust to put good paint over.

I've tried it a few times in the past,  it always came back and bit me in the butt.
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