paint curled

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bigford

bigford

loco junkie
my two bachmann -8's were painted last month with humbrol
matt drak gray and left to dry. i had free time today and wanted
to start decaling them,so i went to the not so lhs and bought
testors glosscote and thinner. got home and mixed some gloss
and shot the two trains and the paint in spots crazed:(:(:mad:

WHAT WENT WRONG!!!!!!
 
Could be thinner that has sat on the shelf for a long time. I had a similar problem happen to me last year.
 
the testors gloss/dullcotes are laquers and will not work very well with paint that is not completely dry. I'd let the paint dry for 3-4 days before using gloss/dullcote.
 


What is the part number on the Humbrol paint? There are some types of Humbrol solvent based paint that react badly with lacquer based coatings like the Testors brand of gloss coating. If you're going to use Humbrol paint, it's a good idea to use the Humbrol brands of clear coatings to ensure that this doesn't happen again. I rarely use Humbrol paint because I've had this type of problem in the past.
 
jim

its humbrol matt 32 (a dark gray) almost kato nyc pa1 gray
i never seen humbrol gloss or flat clear before!!! WILL HAVE
to look for it.. i LOVE there paints,there so nice to thin and shoot:)
 
I would agree that it sounds like you mixed 2 diffrent types of paint? It could also be that the paint did not stick properly and the thinned clear coat got under the paint?

this is one reason I like to use water based paints. its hard to foul them up.
 
According to the Humbrol catalog, the #32 is the same part number for both the solvent and water based paint of the same color. If you're sure it's actually the solvent based paint, I suspect that the lacquer in the Testor's gloss coat got into some thin spots in the paint and caused it to peel up from the back. If I'm airbrushing, I stick with Floquil's clear coatings since they seem to have less potential to attack paint and plastic than Testors. As I said though, I'd use the Humbrol clear coat products if I used a lot of Humbrol paints. Humbrol paints have always seemed to not like mixing with other brands of paints and coatings when I've used it.
 


Humbrol Gloss/Matt Satin Cote is available in the US

bigford said:
my two bachmann -8's were painted last month with humbrol
matt drak gray and left to dry. i had free time today and wanted
to start decaling them,so i went to the not so lhs and bought
testors glosscote and thinner. got home and mixed some gloss
and shot the two trains and the paint in spots crazed:(:(:mad:

WHAT WENT WRONG!!!!!!
Click to expand...

You can buy Humbrol Matt Cote, Gloss Cote, and Satin Cote in 28ml glass bottles from https:www.Squardon.com here in the US. This is NOT the stuff in the small tin cans. Notice Humbrol's spelling is COTE and not COAT so when you are searching for it you'll be able to find it.

http://www.squadron.com/ItemDetails.asp?item=HU0305

http://www.squadron.com/ItemDetails.asp?item=HU0306

http://www.squadron.com/ItemDetails.asp?item=HU0307

www.GreatModels.com has it too.

IT IS THE BEST CLEAR FINISH SYSTEM PERIOD.

I have been using it for years with no issues. And it will NOT yellow over time like the Testors product.

Encourage your LHS to stock all three finishes. They can get it from MMD (they should know who MMD is).

I paint primarily with enamels line Model Master, but have recently switched alot of colors over to Humbrol.

Good stuff.

--jon

--Jon
 
humbrol primer on two undecorated bachmann shells

trains have been repainted and decals started. just waiting to hear
from somebody here before posting the pics
 
Last edited by a moderator:
stationmaster said:
Everyone has addressed the overcoat. But the problem could also be the primer.

Bob
Click to expand...

The PRIMER??? The lacquer overcoat has to get through the paint to get to the primer!

I may not be a master model railroader, but I have been a static modeler for 40 years, and have used the Testors clear coats for years with the exact same issues at times. Other times Testors has worked fine.

Testors will ALWAYS yellow over time.

I then switching to Humbrol clear flat and gloss as a top coat and have had no issues with it at all, including this specific problem over enamels.

I GUARANTEE YOU, the Testors clear is the issue. The paint was enamel, and the clear is lacquer. The lacquer ate the enamel -- period. Ya can't do lacquer over enamel unless you know how to handle the lacquer.
 
Last edited by a moderator:
Cool your jets, CoolRuehle. I was thinking more of a bonding issue. I've had paint peel even before applying any type of clear coat. Issues like orange peel, blistering, and so on.

Bob
 
If it was a bonding issue, that would have shown up as the as the primer was being applied (fish-eye, orange peel, etc).

He stated that primer went on fine, and when he cleared it with the Testors lacquer, it "crazed".

That is clearly (no pun intended) a lacquer-over-enamel issue. Everyone is over-analyzing it.

If you want to put Testors lacquer over enamel paints, use very thin, "dry" coats and build them slowly. But you still run the risk of botching a paint job.

The Humbrol flat over these works beautifully:

Testors Model Master enamels
Testors Model Master acrylics
Humbrol enamels
Vallejo acrylics
 
I agree it is a solvent base issue. One just can't use any paint over another. One can use enamel over lacquer, but not the other way around without a lot of patience and luck. It is tricky at best. I don't even like to use the same air brushes on these different paints. That's why I have (6)airbrushes.(And all of you thought that I was an obsessive/compulsive)

But I've had "orange peel" show up weeks after applying paint. I've even had paint look good at first then lost its bond weeks later, came off in sheets. Like peeling the skin from a peach. It's all about compatibility of the carriers.

Bob
 
many years ago when I use to build custom model cars for people I found that I could do a funky paint job by spraying a gloss base of enamel & then spraying a flat black or some other color of flat lacquer over the top. I never told anyone how I did it & many people tried to copy that paint scheme & never did. I did it by mistake. Gave a real neat krackle paint job. I always told everyone it was a trick of the trade. LOL
 
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