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Old 12-12-2007, 04:56 PM
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Paint chip resistance

Paint chip resistance

I find my 2K HS primer not very tuff and chips on the edges if not very careful.
Is the chip resistance in the topcoat only or mostly or a combination of all coats?

The last car we painted we used a PPG cheaper commercial vehicle truck type 2K solid colour that mixed 4:1:1 where as most topcoats are 2:1.

Are 2:1 paints better than 4:1 ones?
Some HS primers are 2:1, are these tougher than the 4:1 types?

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Old 12-12-2007, 06:18 PM
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[QUOTE=northiam]Paint chip resistance

I find my 2K HS primer not very tuff and chips on the edges if not very careful.
Is the chip resistance in the topcoat only or mostly or a combination of all coats?
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It is a combination of all the products with usually the base if unactivated being the weakest Linc.
Your idea and mine may be different on the easy chipping, yes if you have a 4 foot crow bar in the gap trying to adjust the door, it is going to chip.
Yes the primer may be dry enough to sand but that does not mean it is fully cured out to obtain maximum strength.

Of course if you sprayed the 2kHS over bare metal, that can be an adhesion problem as a lot of 2K's are not made to go over bare metal.

If the 2k was applied over a lacquer, yes it will chip.

If surface cleaning before applying the 2k was not done with a good cleaner, yes it can chip.

If the first coat was dry sprayed, yes you may lack adhesion.
---------------------------------------------------------------

The last car we painted we used a PPG cheaper commercial vehicle truck type 2K solid color that mixed 4:1:1 where as most topcoats are 2:1.

Are 2:1 paints better than 4:1 ones?
Some HS primers are 2:1, are these tougher than the 4:1 types?
--------------------------------------------------------------
Usually the 3:1, 2:1 or 1:1 ratios are for a reason because the resin needs more iso's to cure out, and in theory better.
Now you can of course take one or some of these resins and make it a 4:1
with the activator being all iso's and then reduce an extra 25%.

HOWEVER, you cannot make a blanket statement that a 4:2 mixture is automatically better then a 4:1 ratio, too many factors involve in the manufacturing of the item and you will never know, except by your own testing.
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Old 12-12-2007, 06:31 PM
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Thanks for the reply,
Yes the HS primer was applied over epoxy primer and has been curing over a month now.
Where it chipped was at a panel end where the spot welds are at the panel end. The edge where just the thickness of the sheet metal comes to a sharp end. I was swinging a socket ratchet when it smacked and chipped.

So more hardner does mean harder paint!
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