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General newb questions

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  • Member since
    October 2014
General newb questions
Posted by nowak1981 on Monday, October 6, 2014 2:17 PM

This is my first post here, I was hoping someone might be able to help me out with some airbrushing questions.

I have a Iwata hp-cs airbrush and I am working on a 69 Charger.  I primed the car with dupi-color auto primer and sanded the car with 44 micron sanding film.  I should also point out that this is the first time using an airbrush and the first model ive built in a number of years.  

Anywho, i want to do a two-tone color scheme, where the bottom half of the car is silver and the top is black.  I used the airbrush and Model Master German Silver Metallic enamel thinned 50/50 with mineral Spirits.  Id like to think i put a fairly light coat on, I know i will need several more coats before i can mask off the body line i want and do the top.

My questions are;  Its been almost a week since i put that coat of paint on, the paint is more or less dry to the touch but still sticky.  I know i need more coats of paint.  but should i sand inbetween the coats?  Do i need to wait for a full cure to sand?  or should i just keep spraying and sand when im done?

Any help would be greatly appreciated Thanks!

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Tuesday, October 7, 2014 9:44 AM

Many  years ago, my first year in college, I entered the Fisher Body Contest, a prestigeus national contest to scratch build a car of your own design.  Most people, as I did, used wood as the construction material. I had 60 coats of paint and primer on it before I finished.  Now, the fact that I used balsa, rather than basswood or other harder wood, meant that I had to use more primer coats, but even if it had been a harder wood, I am sure I would have used over fifty.  So lots of coats, sanding between coats, is de regier for good paint job.

Don Stauffer in Minnesota

  • Member since
    March 2003
Posted by rangerj on Tuesday, October 7, 2014 1:08 PM

Some Thoughts: It is best to use the same brand of thinner as the paint, e.g. Model Master paint use Model Master paint thinner. Lacquer dries from the bottom out and enamel dries from the top down so that enamel takes longer to completely dry. Let it dry completely before sanding, masking, and/or handling. The drying time could be a week or so depending upon conditions, e.g. humidity, temperature. Practice with the airbrush and try different media, e.g. enamel, lacquer, latex, acrylic. Generally use paints made for plastic models or coat the plastic with a "barrier" (Testors clear lacquer of Polly S barrier) because some strong lacquers and enamels will attack the plastic and give you an etched surface.

  • Member since
    January 2014
Posted by Seabe on Tuesday, October 7, 2014 10:24 PM

Personal opinion, I may get shot for this... but I never use enamels for large areas such as bodies themselves. Purely because of that - if it goes on just a bit too thick, it never dries. Never had that problem with acrylics and only once with Tamiya rattlecans (with a very old can of the notorius TS36 - and that I still think was more user error than paint).

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Wednesday, October 8, 2014 9:12 AM

I built a homemade drying box using particle board, one of those plastic cases we carry models to shows/contests in, a simple light fixture and a 60W light bulb.  Dries the thickest coat in less than a day.  Before that I would often put model in sunlight behind window.  And with an airbrush a normal coat  of enamel only took two to three days without any artificial drying.

I also used auto touch up lacquers, like Dupli-color,  in their rattle cans.  Usually could get a pretty good finish, and it sure dries fast.

Don Stauffer in Minnesota

  • Member since
    March 2003
Posted by rangerj on Thursday, October 9, 2014 8:31 PM

I put a 58 Chevy Impala painted in candy gold over gold base in a drying box and used a 100 W bulb thinking it would dry quicker. It dried quick but the roof softened and sank about an 1/8 inch.  *$%^#@(

Use a 60 W bulb and make sure that the car is far enough away so that it does not melt!!!! Note: I lined my drying box with aluminum foil to reflect the heat all around the model. It works OK.

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Friday, October 10, 2014 9:34 AM

 In my drying box the model is in another chamber, with a piece of half inch particle board, with holes in it, between the bulb and the model.  The model or part is in the upper plastic container.

Don Stauffer in Minnesota

  • Member since
    June 2010
  • From: Australia
Posted by OctaneOrange on Monday, October 13, 2014 5:18 AM

almost a week? that's some slow drying paint. normally auto paint will be 'touch dry' in an hour and completely dry after 24 (and some paints take about 7 days to gas out). You should only need to wait till it's touch dry to sand between coats. I'd would wait a week before starting the final polishing (i use micromark's polishing cloths then Novus polish liquids) after it's fully set.

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