Chrysler 200 in for a coating, with PTG readings before and after!

parttimer

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Chrysler 200 in for Americoat and a one step polish. Car was in pretty good shape for 100k on the odo and being a 2011. I had previously performed the same work on their Expedition and scheduled this after their SUV was done. It was a full interior and exterior job. Grabbed a few before pictures, but they were at 5pm on a Friday in Ohio which means not much sun. My goal was to wash, decon and start with some correciton before the night came to a close. I finished up Saturday morning with the coating and let it bake in the sun during the afternoon. Since I ordered a PTG for OP removal on my 300 I decided to take some measurements before and after the coating was applied, and I must say I was shocked. Before we get to the PTG stuff, here is the before and after and process.

Wash was megs gold class, tires were cleaned with Tuff Shine twice and Zep 505, wells got 505 and wheels were first hit with acid to remove the bronze color, followed by Sonax FE to remove iron deposits. After the wash, ameririd and speedy prep in medium grade. Polish was a single step with Wolfgang TSR on a white hybrid. Tires picked up black pearl and the wells were sprayed with megs HD. Coating was applied after prepall, and coating was Americana Americoat, 2 coats.

On drop off:
















After polishing and coating, job is completed:




















Now for the coating information. I coated using Americana Americoat. I took PTG readings of the hood by the passenger side headlamp, in micros I saw 176, moving up toward the windshield and I had 134 microns. After coating the entire car, I did a second coat and took readings again. For the headlight area it went from 176 to 202 microns, the 134 micron measurement went up to 156 microns! I will be checking this again with a few other coatings, I have some UK as well as Kamakazi ISM and Miyabi waiting to go on my 300. I'll post information after I get that done. Which I hope to get done this week.
 
That's a pretty amazing increase in PTG readings from Americoat...I predict this was some instrumentation error (sorry).

I mean you do realize that's about a mil thicker, i.e. half of the thickness of the clear on a new car.
 
It could be some variation, I did check and recheck each area to get the readings. I checked before the application in the same area twice and again after. Of course its not a thousand dollar unit and I didn't tape off the area to ensure I got a pin point location. I may do that next time, I have the spoiler off my 300 so I can do a few squares to ensure accuracy when I try these other coatings. I will be sure to take pics before and after as well. I guess any increase in thickness is a win though!
 
This type of test needs to be done in a very controlled environment where thousands of data points could be taken across a panel before and after coating.

If you consider the volume of coating in a 30mL or 50mL bottle, there is no way you can add that much material throughout an entire vehicle.... unless the coating is expanding substantially (not the case). So that should have been a red flag right away.

You must consider the fact that a micron is an incredibly small unit of measurement, and it is impossible for any vehicle to be sprayed uniformly (ie exact same depth throughout). If you do not take your reading in the exact same spot... I mean exact... down to the millimeter... then chances are you will get a slightly different reading. Sometimes a substantially different reading.

You'll see that most coatings claim 1-2 microns of added material, I think if you asked Barry he would mimic those claims for Americoat.

Just want to make sure someone doesn't read this and expect a coating to add as much material as a coat of paint.


-Zach
 
I agree, i got a little excited when I saw those numbers. My plan is to tape a square off that allows the round head to fit in the exact spot for measuring. I'll let everyone know tomorrow! I hope!
 
You must consider the fact that a micron is an incredibly small unit of measurement, and it is impossible for any vehicle to be sprayed uniformly (ie exact same depth throughout). If you do not take your reading in the exact same spot... I mean exact... down to the millimeter... then chances are you will get a slightly different reading. Sometimes a substantially different reading.

I agree, i got a little excited when I saw those numbers. My plan is to tape a square off that allows the round head to fit in the exact spot for measuring. I'll let everyone know tomorrow! I hope!

In addition to actual variations in coating thickness, I think there are some vagaries in eddy-current testing which add to the uncertainty of these readings.
 
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