Could not remove paint

Calendyr

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Ok Mike I have a question for you.

Today I had a client who wanted to me to remove paint on his car. He lives near a construction site where they are building a new hospital. Last week he called me to come remove paint that had fallen on his car. I was booked till today so he had to wait 5 days.

So when I get there, his Black Toyota Corolla is covered with specs of what appears to be white paint. The panels feel rough to the touch and you can clearly feel something sitting on the clearcoat with your finger.

So I quoted him 2-3 hours of work to do the whole car (it needed cleaning too) and went to work.

After doing a rinseless wash (car is on a street with no access to water or electricity). I removed a ton of tree sap from his paint. There must have been about 40 drops of it all over the horizontal panels.

Then I went after the paint specs...

1. Tried using clay... it removed a ton of contamination from the paint, the side of the clay was gummed up after doing a 2X2 section... but none of the paint specs came off.

2. Tried a nanoskin fine grade sponge. It did a little. When I first started I could hear and feel the contamination but after a little while the sponge was gliding effortlessly and soundlessly across the paint will pretty much all of the paint specs still there. It might have removed some but there was no visual difference.

3. Tried using WD-40. Nothing.

4. Tried using Goo-Gone. Nothing

5. Tried using IPA 50%. Nothing

6. Tried Wax and Grease remover. No change.

7. Tried using 3M adhesive remover. No change.

8. Tried using Brake cleaner. Nothing

9. Tried using professional paint cleaner. Nothing

So I broke out the big guns:

10. Tried using Paint Thinner. Nothing

11. Tried using Acetone. Nothing.

At that point I gave up. A compound might have worked but it was not in the client's budget. But somehow I doubt a compound would able to remove something clay could not remove.

So my question is, what would you have done and do you have any idea what this stuff could be to be able to resist every single solvent I had and also resist physical decontamination? I have never had a problem like this before and I am baffled nothing worked.

I did not charge the client anything since I could not fix the problem. At least he got his car cleaned for free ;)
 
Photos may help, especially if you can get some macro shots.

It might be concrete or some type of masonry or drywall product. Something like that could resist many solvents, and concrete spray can adhere well to automotive paint if allowed to cure. If the car was parked near a place used to clean up concrete or drywall equipment, the overspray could've been carried over to it.
 
Just a thought, what if its not paint but polyurethane.. of the sort that is used to seal roofs.... its often spray applied..

We had this undertaken at an old work site and no surprise the wind picked up and it dropped over a car park..

The detailer had to use a razor blade to lift it.. took him half a day per car.. and a revist on a couple as it was not all off..
 
Just a thought, what if its not paint but polyurethane.. of the sort that is used to seal roofs.... its often spray applied..

We had this undertaken at an old work site and no surprise the wind picked up and it dropped over a car park..

The detailer had to use a razor blade to lift it.. took him half a day per car.. and a revist on a couple as it was not all off..

+1
 
Have you tried lacquer thinner on paint only.I had a customer who had a Altima covered in paint last year and nothing would take it off.I had to have this job due to the $$ that was involved,Tried everything under the sun and zero results,lacquer thinner was my only last option still no results.I went down to ag and got 2 fresh bars of cg black clay went back to the house and it came off.
 
If a compound would take it off and the customer deosnt want to pay just move on.obviously it's not that great of importance to him.
 
Ya tried Paint Thinner, I am pretty sure it's the same as Lacquer Thinner (could be wrong). Only solvents I have not tried are Varsol and Mineral Spirit. I don't have either of those.

Clay did not work.

I quoted him 100-140$ for the job, he was hesitant to do it. That is for 2-3 hours of work. So I am sure he would not have wanted me to spend 3-7 hours compounding then polishing the car. That is why I walked away. Anyhow I had no confidence compound could remove something clay could not.

I thought about using a razor blade but I am afraid of damaging the paint. Also the specs were tiny, about the size of a needle head. So I am unsure how effective a razor would be on something so small.
 
Ya tried Paint Thinner, I am pretty sure it's the same as Lacquer Thinner (could be wrong). Only solvents I have not tried are Varsol and Mineral Spirit. I don't have either of those.
Paint thinner and mineral spirits are similar; lacquer thinner is generally a much stronger solvent. I'd be concerned about lacquer thinner attacking the paint and plastic.

I wouldn't bid the job until you've figured out what that stuff is, how best to remove it, and how much damage you'll have to correct after removal.
 
Paint thinner and mineral spirits are similar; lacquer thinner is generally a much stronger solvent. I'd be concerned about lacquer thinner attacking the paint and plastic.

I wouldn't bid the job until you've figured out what that stuff is, how best to remove it, and how much damage you'll have to correct after removal.

I watched a few videos about people using Lacquer Thinner to remove paint on clearcoat, It worked well and did not cause any issue. I am sure if you let it sit there for a long time it would be a different story but just doing a wipe with it is ok.

As for the quote, that was a mistake on my part based on past experience. I was expecting this to take very little time. I have removed spray paint in under 3 minutes before, so I was not expecting this to resist everything I had in my arsenal. Rest assured next time I will do a test spot before doing an exact quote ;)
 
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