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Using 6400 Series 2K Urethane Sealer as Primer

#1
I'm thinking about adding the 6400 series urethane sealers to my mixing bench in black and white for use as sealer OR primer in the gray shade of choice.

There isn't much info in the tech manual on what to expect from using 6400 as a primer as far as maximum film build (or roughly the number of coats) or cure through times. I would assume this material to be a bit slower at through cure than standard SPI 2K urethane? Would it be OK to use Polar when using this as primer? How much?
 

Barry

Paint Fanatic
Staff member
#2
I don't like the idea of adding polar to this product under any circumstances.
This product is made different then a 2K primer and is very tightly wound.

As a sealer if added, you could either create a sensitivity problem or worse create an adhesion problem.

Would this be a good primer mixed 4:1, yes but in my book more for small areas or small parts, like a cycle tank.

The cure on this primer is very good as it sets.
 
#3
I never add Polar to urethane sealers as it is just asking for sensitivity problems. I was referring to adding it only when using the product as primer. But from what you say, I should neither do that nor use this product as a primer for filler areas?
 

Barry

Paint Fanatic
Staff member
#4
The primer will be fine for a door you have filler in and need to primer the whole door.

I just don't see any benefit to using this as a primer for everyday collision work and surly would not use it to primer a whole car.

It would work and if you want to great, I just can't see the benefit.
 
#5
well this is good info,lol!!!
guess i should have asked before hand

i have been adding small amounts of Polar to this(6400 series) for a while.

we use it 4-1 as a primer in my shop everyday.

anything from all down a side to a small ding area and it works great!or has.

it is plenty thick mixed 4-1 and fills excellent for what we do.

so i hope we have not been screwing up by using this exclusively as a primer and adding Polar on the very cold days and nights?

the whole reason i quit using the regular 2k was b/c i didn't want the clutter of having all the different Product on the shelf

Travis
 

Barry

Paint Fanatic
Staff member
#6
Your not screwing up and for type of work you do, it may work just fine as if you are happy with it, that is all that matters and the polar as a primer, I would only do that on the blocking coat and not your final coat.

I have never tried this primer on a very large area, so only going by the way it is formulated and I may be wrong, it has nothing to do with product performing as maybe product use-ability and I do know there are a number of people that do use it for general primer work.
 
#7
Barryk;17167 said:
Your not screwing up and for type of work you do, it may work just fine as if you are happy with it, that is all that matters and the polar as a primer, I would only do that on the blocking coat and not your final coat.

I have never tried this primer on a very large area, so only going by the way it is formulated and I may be wrong, it has nothing to do with product performing as maybe product use-ability and I do know there are a number of people that do use it for general primer work.
well thanks Barry!

and for those that Dont Know i Do Collision Repair not Restorations.

i only add Polar when mixed 4-1 as a Primer.never ever would add it to Sealer.

i have Sprayed large Areas with this as a Primer and works Great for me.

i am Very Happy with it as my Primer/Sealer Needs in my shop as with all your Products.

P.S. have a Nice Story i need to call and tell you about how i came out the other Day with my Experiment of a Brand i knew better to Play with,LOL!!!!

Travis
 
#8
Barryk;17159 said:
The primer will be fine for a door you have filler in and need to primer the whole door.

I just don't see any benefit to using this as a primer for everyday collision work and surly would not use it to primer a whole car.

It would work and if you want to great, I just can't see the benefit.
To me the benefit is the simplicity of having as few products as possible in my inventory. This allows them to be used up faster, so they are always fresh. Also, the product I would be replacing is formulated to be used as a primer or a sealer, so I am used to having things that way. If I could use 6400 for everyday work, then I would simply buy a gallon of regular 2K or Turbo when a complete comes in.

But I really hesitate to do this if the boss is not behind the plan 100%!
 

Barry

Paint Fanatic
Staff member
#9
Crash, with your reasoning, it may be perfect for you, every situation is different it it wasn't I could kill about $800,000 of inventory and just offer one clear, one primer and one speed reducer and have more spare time then I could ever imagine!
 
#10
Well, I'm sure you'd rather have me use the exact right product for every different situation (I would too), but I know when I get too many products, they end up sitting on the shelf longer than I like, and once they're open it's like a crap shoot 6 months down the road whether the activators in particular will do the job or not...
 
#11
crashtech;17178 said:
Well, I'm sure you'd rather have me use the exact right product for every different situation (I would too), but I know when I get too many products, they end up sitting on the shelf longer than I like, and once they're open it's like a crap shoot 6 months down the road whether the activators in particular will do the job or not...
Hmmm, speaking about activator life once you open them, one thing to consider is that the 2K Regular and the 2K sealers use the same activator, so that plays to your advantage. You will use the same activator for both and will go through it rather fast, no?


Just a thought.
 
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