Paint Problem

[vintage modeler 1]

Hi, I am new to this forum. I need some help with a paint problem with the PS paint. After following all of the prep instructions ,I ended up with a lot of dark blotches. What is causing this?Thai happend after the first coat.  

[svenb 4587]

What prep did you do?

Was it cold when you sprayed?

Tamiya PS paint?

Assume you really shook the can up and it wasn't cold!

I don't think I've ever seen a reaction like that before 🤔

[TurnipJF 10804]

In the photo it looks like the shell is dirty on the outside. What colour paint is that?

[Elbowloh 1483]

I was thinking the same. That looks like it might be the outside?

[vintage modeler 1]

1 hour ago, svenb said:

What prep did you do?

Was it cold when you sprayed?

Tamiya PS paint?

Assume you really shook the can up and it wasn't cold!

I don't think I've ever seen a reaction like that before 🤔

Did all the prep as req.The hobby room was about 55Degrees Fahrenheit  

[vintage modeler 1]

54 minutes ago, Elbowloh said:

I was thinking the same. That looks like it might be the outside?

 

Just now, vintage modeler said:

Did all the prep as req.The hobby room was about 55Degrees Fahrenheit  

On the inside

[vintage modeler 1]

1 hour ago, TurnipJF said:

In the photo it looks like the shell is dirty on the outside. What colour paint is that?

 

Just now, vintage modeler said:

 

On the inside

PS #1

[Twinfan 2308]

Exactly what prep did you do?  And how did you paint it, what was the technique, how many coats does it have on it at the moment?

Without a detailed description of what you did it's hard for us to suggest where you may have gone wrong, if indeed you have and it's not just a faulty can of paint.

[vintage modeler 1]

1 minute ago, Twinfan said:

Exactly what prep did you do?  And how did you paint it, what was the technique, how many coats does it have on it at the moment?

Without a detailed description of what you did it's hard for us to suggest where you may have gone wrong, if indeed you have and it's not just a faulty can of paint.

I washed with soap and water thoroughly, let dry overnight Sprayed one light coat out of can. Got this reaction immediately . Then put on another coat, figuring it would disappear, only got worse. the hobby room was about 55 degrees Farenhight

[ucacjbs 172]

Apologies for dumb questions, but we’re debugging and sometimes it’s good to check everything. 
 

1. did you shake the can well?

2. Had the can been stored in this same room at 55F?

3. Did you spray the inside of the shell? 

4. How close to the shell was the nozzle?  

Edited January 29 by ucacjbs

[vintage modeler 1]

1) yes 2)no 3)yes 4)about 4"

[ucacjbs 172]

Beginning to look like something wonky with the paint itself. The paint was stored in a warmer place than the hobby room? 

[vintage modeler 1]

Paint stored at room temp. I don't think that's the issue. Could the paint be defective?

[Pizza Frog 772]

Maybe a problem with the dishwashing soap? Maybe it had oil in it or something?   Otherwise a very old or defective can of paint. 

[Blista 1606]

Get a clear plastic bottle or something similar.  Go through the same steps and see what happens on that.

[vintage modeler 1]

Just ordinary Dawn Liquid soap. Paint just purchased from hobby store week before. 

[vintage modeler 1]

1 minute ago, Blista said:

Get a clear plastic bottle or something similar.  Go through the same steps and see what happens on that.

Good idea but if it is the same result???  or if it is fine then what??

[Blista 1606]

5 minutes ago, vintage modeler said:

Good idea but if it is the same result???  or if it is fine then what??

If it comes out the same then chances are it's either the paint or something you're doing.  I'd get a new can of paint if you're reasonably certain you're doing things right.

Get some Tamiya polycarbonate body cleaner if you can.  That can be used to clean out the failed paint on the body.

[vintage modeler 1]

I'm positive I have taken the right steps. Can I use rubbing alcohol to clean the body next time, if that is the problem?

[Blista 1606]

16 minutes ago, vintage modeler said:

I'm positive I have taken the right steps. Can I use rubbing alcohol to clean the body next time, if that is the problem?

I've never tried anything other than the Tamiya body cleaner so I couldn't say.

[vintage modeler 1]

4 minutes ago, Blista said:

I've never tried anything other than the Tamiya body cleaner so I couldn't say.

I'm positive I have taken the right steps. Can I use rubbing alcohol to clean the body next time, if that is the problem?

Unfortunately this product is discontinued in Canada

[Blista 1606]

6 minutes ago, vintage modeler said:

Unfortunately this product is discontinued in Canada

If you search the forum there's bound to be a few threads about other products people have used.

[Howards 821]

I suspect there was something on the inside that either the soap did not remove or was left behind by the soap. 

when using ordinary house hold cleaners to prep the body you have to be certain you’ve shifted all trace / residue as the stuff it can leave behind is probably worse than the gunk and release agent you are trying to remove. 

[Twinfan 2308]

Yep, I'm wondering if the soap wasn't washed off enough?  You don't mention rinsing the body thoroughly after washing it?

[ImALlama 1586]

I’ve had this happen to me quite a few times, or looks like same that happens to me. Usually when I put in extra effort to clean and make sure not to touch the body without gloves so it comes out perfect. Based on where it happens, patterns, temps, etc, I’ve always assumed was caused by oils/residue from the soap that I didn’t get fully cleaned. Might just be me or the amount I use but I’m often annoyed with how much extra rinsing it takes to get dawn off my hands as it seems to take forever, but always forget this when using it to clean bodies. 
 

I doubt it’s the paint as I’ve had this happen then used same paint several times after without any issues. My paint is usually a mix of new to several years old and anything older goes through many large temp changes, only thing that’s been consistent when this happens is my prep/paint process.

7 hours ago, vintage modeler said:

Can I use rubbing alcohol to clean the body next time, if that is the problem?

Never hurts to test in small section but this is what I’ve done on last three I painted and came out perfect. Last few I’ve just taken the bodies out the box, thoroughly wiped them down with alcohol, let dry, mask off wearing gloves, and paint.