Paint Problem

[se5a12]

Hi everyone,
Sorry if this has been covered somewhere before but I have a paint problem with mainly resin kits.I firstly clean the parts using normal soappy water and leave to dry,its then that I use a standard rattle can white car primer that I apply lightly that the paint seems the leave holes as if it won't apply properley to certain parts of the surface.sort of like a blotchy effect.A second spray improves it slightly etc but I shouldn't need to do this.I have even noticed this on some plastic kits.Has anyone come across this...Thanks

[NeilE]

Hi Se5a12;

It could be one of three things maybe. Firstly, your soapy water may not have taken all the mould release agent off the kit parts, thus leaving parts where the primer does not 'take'. I suggest trying a stronger detergent than what you may be using and see if that does any good.

Secondly, I notice you are using an automotive white primer to prime your models. Some of these are manufactured to work best on metal surfaces and may not work so well on plastic type surfaces. You could try a model specific primer such as the Tamiya Grey which I find works every time.

Thirdly, it could be a viscosity issue. Are you giving the can a good shake first? Also to improve viscosity, try leaving your can in a bucket/whatever of warm/hot water for a bit as this usually gives a more even flow and thus coverage.

Of course, there could be a totally different explanation that another forumite can suggest. Any other suggestions anyone?

Anyway good luck with it!

Cheers

Neil

[berman]

The model should first be thoroughly washed with a good liquid detergent such as Dawn dishwashing detergent and warm water. All automotive primers are not the same. Most contain talcum power as a filler. I have had excellent results with Dupli-Color grey Primer Sealer. A twelve ounce spray can sells for five dollars at auto parts stores. A light mist coat is followed by two heavier coats, ten minutes apart. This results in a perfectly smooth finish and is thin enough not to obscure fine details. It is important to spray in an evironment of about seventy degrees Fahrenheit to ensure the proper viscosity.

[Rittersbach]

Originally Posted by berman

The model should first be thoroughly washed with a good liquid detergent such as Dawn dishwashing detergent and warm water. All automotive primers are not the same. Most contain talcum power as a filler. I have had excellent results with Dupli-Color grey Primer Sealer. A twelve ounce spray can sells for five dollars at auto parts stores. A light mist coat is followed by two heavier coats, ten minutes apart. This results in a perfectly smooth finish and is thin enough not to obscure fine details. It is important to spray in an evironment of about seventy degrees Fahrenheit to ensure the proper viscosity.

Dawn detergent is an excellent choice. Dawn will strip all the wax from your motor car if you add it to the wash basin when you wash your auto. It does an excellent job removing the releasing agents on the sprue trees. Good luck!

[Tom L.]

91% isopropyl alcohol is also good for cleaning release from resin parts.