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Old 06-01-2012, 06:34 PM   #26
Scooby Specialist
Member#: 275888
Join Date: Mar 2011
Chapter/Region: MAIC
Location: Frederick MD
2011 WRX Limited


Originally Posted by AspenScoob255
Nice work Peyton, that GTR looks gorgeous.

While your claim that IPA swells and softens paint is true, it is not entirely accurate.

Yes, higher concentrations of isopropyl alcohol CAN be absorbed into the paint causing swelling and softening. However, the effects are not permanent and your paint will eventually return to normal. This is similar, if not the same, as the process in which solvents leave the paint over time after a fresh spray.

Now, the use of IPA is fairly straight forward. As for dilution, the more you dilute IPA the safer and less likely to cause swelling it becomes. I personally use about a 10%-15% mixture (I eyeball my mix so its not exact). Higher concentrations will removed oils and such faster however.

On a side note while trying different dilutions levels I used 90% IPA straight out of the bottle and had no issues with swelling or softening on black BMW paint. Of course individual results may vary and that high of a concentration is simply not necessary.

Not to mention the fact that IMO/IME it evaporates entirely to fast at that high of a concentration level to be effective.
Lol I gotcha, just trying steer possible noobs from IPA wipedown disasters. Going after it with an orbital if you do have swelling and softening can trash a paint job. I've seen 70% IPA we use for biohazard decon eat POWDERCOAT off of utility drawers on our parts bin.
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Old 06-04-2012, 04:04 PM   #27
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Member#: 322201
Join Date: Jun 2012
Location: Ohio

Originally Posted by metros View Post
It's to make sure there are no waxes/fillers on the paint to hide the swirls.

What did you use on the exhaust tips? Those look gorgeous.
Yeah...what did you use on the exhaust tips?
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Old 06-04-2012, 10:53 PM   #28
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Join Date: Sep 2002
Location: So. CA
'08 Foz Prem TGM
'10 Challenger R/T Blk


....I would even go as far to say any damage (or swelling) at all by IPA on modern, fully cured clearcoat paint is at least arguable. I have seen respected sources advise caution with higher concentrations while others have no real concern. ....even a respected chemist (Ron Ketcham) on another forum I frequent has sided with the latter. Here's a little tidbit from that industry expert on the subject of "swelling" with solvents and IPA:

Some will "swell" the paint substrate, no doubt.
Usually clorinated versions.
Butly cellosolve components used in many all purpose cleaners may create minor swelling as well.(I could spend a lot of time posting some serious concerns created by butly based all purposes and synthetic transit coating removers did to thousands of new vehicles that never got out of the assembly plants storage yards.)
Rule of thumb, if it "swells" the paint, it is attacking the chemical bond of the paint film, which usually means one may observe some damage later in the life of the paint system.
Lacquer thinner, xylene, toulene, acetone, MEK, etc are examples of solvents that may not show any adverse effects immediately after being used on a modern clearcoat system, however history has shown that at sometime in the future, the damage will become apparent.
When I was teaching the PrepExcellence detailing course at AI, students often questioned the same thing which enthusist ask,"why can't I use lacquer thinner, PrepSol, etc when I detail, after all the bodyshops use it?"
Why not, well a bodyshop is using these to remove any silicone residue, etc and are going to sand, prime and repaint the vehicle, so no concern.
Not true for the home or "professional" detailer, they are not refinishing the vehicle.
So, a few weeks or months or even a year or two passes and they can't understand why some area's of the clear is going away.
They did it, they just took the easy way and were not educated on what damage clorinated solvent blends may do to these modern paint systems.
IPA will not damage a quality paint finish, either OEM or refinish.
Simple, and if you look at what is in the solvent systems used today, IPA in one form or another is present.
It is compatible, it will not damage a quality finish.
Bill menitoned using the New Car Prep, which the same non-damaging system is used.
However, it may leave a small "petro" based residue, and therefore after I used it to remove residue, always followed with a light wipe of IPA to insure complete removal of any opitical petrocarbon residue.
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Old 06-05-2012, 02:01 AM   #29
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Join Date: Jul 2011

Originally Posted by Alistairh View Post
Looks fantastic. I also have some swirls on my GT-R and other vehicles that should be addressed.

I've also got some weird chipping on the main body near the rear pillar, and the top of my wing doesn't look so hot.

But damn, the after result is just pure sex. Nice job man!
Find your self a knowledgable detailer! Or, I'm willing to travel

Originally Posted by vooch View Post
Yeah...what did you use on the exhaust tips?
I use a metal polish I get from a local detail shop. Best stuff ive ever used!
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Old 06-05-2012, 09:53 AM   #30
2.5L Monster
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Join Date: Jan 2012
Chapter/Region: MWSOC
Location: 269


Car looks great!

How long from start to finish?
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Old 06-05-2012, 07:18 PM   #31
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Originally Posted by 2.5L Monster View Post
Car looks great!

How long from start to finish?

I think around 12 hours?
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