With that mixing ratio, I believe you purchased PPG's Delstar acrylic enamel, or possibly PPG's Shopline JE acrylic enamel. Both of these can be sprayed and will dry without the use of a hardner, however, to clearcoat them you MUST use the hardner, otherwise the clearcoat could "mottle" the metallic and it may lift the color. Even if you decide not to clearcoat the inner, I would recommend using the hardner for better performance and durability.

Joechief

 

iam a retired painter and never heard of a 8.1 mix with hardner the norm has been 2.1 3.1 do u think that little of amount of harder will stop any lifting. the paint i bought it from the MOCO it is acrylic urathane i just dont want to run into any problems. when i first ordered the paint i thought it would come in a base coat or waterborne but was very surprised to see a singlestage paint is this what they use at the factory. one more thing can i use a universal hardner with this paint and is 8.1 good enough for a clear coat. the clear iam using only needs hardner i could reduce it if iam blending any paint. help thanks again.
Rick

 

Are you sure about the mix ratio? Four years ago I bought HD paint (1 qt birch white) and believe that quart was mixed with the 8 oz. urethane hardener (p/n 99825-02) which results in a 4:1 mix (32 oz. paint with 8 oz. hardener).

Good luck with your project.

Carl

 

As far as mix ratios go, typical urethane single stage paints or urethane clearcoats have the ratios you described: 2 to 1, 3 to 1, 4 to 1. When Roadgliderick mentioned 8 to 1, that is a ratio found with the older acrylic enamels. Or more simply, a gallon of paint to a pint of hardner. I too found that odd that HD would have sold an acrylic enamel, but as I mentioned before, I have not purchased paint from HD in a while so I am not sure what they offer.

Joechief

 

Yes, if that is the recommended ratio I would go with that. The ratio is consistant with what the acrylic enamels of the past used; 8 to 1, or a gallon of paint to a pint of hardner and I agree with you that most of the single stage urethane topcoats and clears use the 2 to 1, 3 to 1, 4 to 1, so again I am not sure what HD is selling.

Do I think that small amount of hardner will prevent lifting? Yes I do, again if that is the recommended amount, it should be just fine. The catalyst will prevent lifting and if that is the amount called for, let her buck.

Could you use a universal hardner? Yes, providing it is a hardner for topcoat / clearcoats. Do not use a hardner recommeded for primers. Typically topcoat hardners are a dual isocynate vs. primer hardners which are single iso. The difference being that for performance issues due to what a topcoat is exposed to; i.e. UV rays, weather, etc. the dual iso. provides that. Primers would not be exposed to these elements.

Hop this helps.

Joechief

 

yes that helps very much and it makes better sense to me thanks again for all your help.
Rick

 

[QUOTE=jharanin;7663542]I found a flame blue in 2009 PPG 921100....And in ain't gonna be cheap...around $120 a pint...has some limited use use toners in it.[/QUOTe

My local painter couldnt mix this color;he had all the ingredients but one,and everyone of his suppliers got big bucks for that ingredient.

Luckily one of the local custom painters had an uncut pint of the flame blue pearl leftover from a previous job;sold it to me for $50.

 

[QUOTE=BDHABT;7671958]Sweet!! Glad you found the color and still have some money for Christmas!! lol.

Joechief

 

Consider it my little Christmas gift to you!! lol.

Joechief

 

yes sir the can clearly states 8.1 mix ratio and thank u.