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How to increase paint hardness

We are painting with NC paint (automotive - duco brand of icici) on machined cast iron pieces. The paint is not hard enough as even small scratches from nuts and bolts start showing very fast.

How can we make the paint harder?

A Ahuja
Printing machines - India
2005

Dear sir
The increase in hardness is not favorable because it may affect other properties but if you want to increase the hardness of your paint you can accelerate the drying of your paint by using short alkyd resin with NC and also use dibutyl phthalate as placiticzer to maintain your balance of hardness.

Esmail El Nabalawy
- Port Said, Egypt
2005

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