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  #16 (permalink)  
Old 06-20-2010, 08:42 PM
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Boy am I sorry I ever brought up mention of lacquer.

I thought a lacquer was simply a cellouse product or resin disolved in organic solvents, that air drys-cures by solvent evaporation, and can be reliquidfied or reflowed by those solvents.

Most bases I understand contain cellulose acetate butyrate to help it cure quicker. From some searching looks like this also helps with redissolve resistance to solvents in the clearcoat.

I thought most bases had little or no reactivity. Isocyanate I understand from reading will react with saturated polyester resin to form urethane bonds. But unless there is something else in the reducer or paint that does this, I don't know how you are getting urethane bonds. If I keep dbc "or other bases" covered up tight, it never hardens up in the can, and same if I add the reducer to it, never hardens if I keep it covered.

I believe so little isocyanate is in basecoat hardener, I don't see how there is a lot of crosslinking or reactivity going on there either. I thought the activator mainly helped intercoat adhesion with the clear, more then crosslinking in the base. I can mix in base hardener and it will also stay liquid a very long time. Sure it will eventually harden, but the isocyanate will do that all on its own.

At any rate I say base is a 1k product, and certainly if no activator is added. And at least what I think of when I think of a urethane, good gloss, solvent resistance, durability, In my mind at least its more closely related to a lacquer.

I'll just stick to painting, and not fool with or try to understand the chemistry. It only makes my head hurt anyways, and obviously creates a stir.

Quote:
Originally Posted by Rodger
Urethanes have solvent in them and dry when it evaporates out like a lacquer does
I can sort of see that, all I have to do is think of urethane construction adhesive or the spray can urethane insulating foam.
Lacquer, lacquer, lacquer. There, now that should have you guys in a tizzy for awhile.

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  #17 (permalink)  
Old 06-21-2010, 04:02 AM
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Quote:
Originally Posted by kenseth17
Boy am I sorry I ever brought up mention of lacquer.
Don't worry, lacquer has very little reactivity, as far as being the same.
not even close, you decide what the stuff is with the polyol or ol's that are bended in and that is where the reactivity comes from.


I like the cut and paste about polyester/
Lets see its used for lacquer, base coats, plastic, fiberglass resins, paints, shirts and God knows what else and the amount in a base is a small part compared to a lacquer.

But if you don't believe it use your urethane clear over lacquer, it will work but its coming off for sure we just can't say when.
OH, that is where the polyol comes in and the polester gets cut back to next to nothing as well as the CAB's.

Crap bases that are enamal conversions, I have never made and don't have a clue, as to trickery they use.

17 not sure why you even responded to this guy.
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  #18 (permalink)  
Old 06-21-2010, 07:26 AM
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Quote:
Originally Posted by BarryK
17 not sure why you even responded to this guy.
I'm done with him period.

His profile says Africa. In his posts he says a few times "here in Nicaragua" which is in central america. And then in one place he says he lives in the states now. Best I can tell he likes to build plastic models and he practices his painting on plastic spoons (posted some pictures of those). He did talk about painting wheels but it wouldn't surprise me if those were models too.

He's a big-boy wannabe and should stick to the model building forums.
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  #19 (permalink)  
Old 06-21-2010, 12:35 PM
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Quote:
Originally Posted by roger1
His profile says Africa. In his posts he says a few times "here in Nicaragua" which is in central america. And then in one place he says he lives in the states now..
Well I was kidding when I put Africa, and I am living in nicaragua now, but I used to live in the USA, where the Best car I own was a bad painted 1979 Trans am with a Olds 455 (from a Cutlass) but I wonder Why are you so Rude? I mean its Just an interesting Subject guys like 17 and BarryK like to ponder about it....

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Originally Posted by BarryK
17 not sure why you even responded to this guy.
Quote:
Originally Posted by roger1
I'm done with him period.
Roger Buddy he is talking to you Boy..
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