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Bubbling of paint

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  • Member since
    April, 2018
Bubbling of paint
Posted by cyclechef on Saturday, May 19, 2018 3:50 PM

Getting back into modeling. Can anyone tell me why mybpaint and primer are not adhering and bubbling off model. I have wet sanded the areas and it continues to happen. I thought it was the primer that I was using - Rustoleum primer for plastic. But I sanded that off and used Tamiya and it is still happening. I don’t want to go any further on this model until I know what cause is and how to rectify. Any help is greatly appreciated. Thanks. 

  • Member since
    December, 2008
  • From: UK
Posted by PatW on Saturday, May 19, 2018 4:14 PM

I'm in the UK but the idea is the same. It looks as if you have a greasy/dirty, surface that needs a good clean, warm soapy washing up liquid should sufice, and many cold water rinses until clean and dry naturally, taking time. 

Starting with primer, I use an auto matt grey rattle can tin, shaken/or sat in a small  plastic ice cream tub with a few inches of near boiling water in. Warm to atomise the paint for 5 minutes and then shake as per the can instructions, in this case 2 minutes.

Test spray into the air/spray booth to make sure the nozzle spray is nice and regular.

Spray from 30 cms or 12 inches, just a cover coat, let dry. Another 30 minutes later, just again a light coat leave for an hour or so. If it's covered the surface so in my case I can only see grey, If I'm choosing a light final coat, yellow etc spray on a few light coats of matt white.

I warm the first coat of colour when all primers/undercoats are perfectly dry, and again light coats at a distance gradually building up the colour, how ever many is needed to get as near a glossy coat as needed. 

Depending on whether it's a race car or not depends on what /if you want to put on decals and a series of light coats of gloss clear to enhance the shine.

I don't use a an air brush so I don't now about thinning ratio's of paints etc.  

Remember , common sense is not common.

  • Member since
    February, 2003
  • From: East Bethel, MN
Posted by midnightprowler on Saturday, May 19, 2018 4:24 PM

Can you post a pic of what is happening?

Hi, I am Lee, I am a plastiholic.

Co. A, 682 Engineers, Ltchfield, MN, 1980-1986

1 Thessalonians 4:13-18 1 Corinthians 15:51-54

Ask me about Speedway Decals

  • Member since
    April, 2018
Posted by cyclechef on Saturday, May 19, 2018 4:36 PM

I would like to insert a picture but I can’t figure out how to do it with regards to the aizing requirements. 

  • Member since
    April, 2018
Posted by cyclechef on Saturday, May 19, 2018 5:49 PM

I guess I can send an email. I can’t figure it out. Sorry. 

  • Member since
    April, 2018
Posted by cyclechef on Sunday, May 20, 2018 5:17 AM

Thanks. I will give it a shot. I’ll clean everything and the use your warming method for the primer and paint. It’s for the Tamiya F1-2000, so I will be using decals.   I tend to also rush things so maybe I was not waiting long enough for primer to dry. How long do you suggest?  

  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Sunday, May 20, 2018 11:09 AM

Is this a resin or styrene kit?

Don Stauffer in Minnesota

  • Member since
    April, 2018
Posted by cyclechef on Sunday, May 20, 2018 1:50 PM

Not sure. Looked on the box and can’t tell. Is there a way to tell?

  • Member since
    December, 2008
  • From: UK
Posted by PatW on Sunday, May 20, 2018 2:20 PM
In your case perhaps leave all paint to dry for 12 hours at least, try it and see anyway.

Remember , common sense is not common.

  • Member since
    April, 2018
Posted by cyclechef on Sunday, May 20, 2018 2:28 PM

Thanks 

  • Member since
    April, 2003
  • From: USA
Posted by keavdog on Sunday, May 20, 2018 3:15 PM

Some paints don't play well together

 A hot lacquer color coat can sometimes cause nasty interactions with a primer of a different medium e.g. acrylic or enamel .  Try shooting the color coat on bare plastic and see what happens.

Thanks,

John

  • Member since
    April, 2018
Posted by cyclechef on Sunday, May 20, 2018 4:04 PM

Thanks. Will give it a try 

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