Letting regular build 2K sit for months

CoronetRob

CoronetRob

Promoted Users
Hello all.
I’ve been reading this awesome forum for some time now. I’ve finally registered and look forward to learning and sharing.

My name is Rob and I’m into old school offshore boats and musclecars.
I own a 1968 coronet RT.

Anyhow, I’ve taken on a project for a car buddy. It’s a 1971 Dodge Dart.
I’ve done all the metal work and filler and shot 2 coats of epoxy primer and let it set for 2 days. Then I shot a wet coat of 2K regular build and let it set for 2 days. Over the last week or so, I’ve been fine tuning any imperfections and plan on shooting another 2 coats of epoxy and 2 to 3 coats of regular build 2K.

I’m in Ohio so my season is just about over. I’d like to let the 2K sit until spring and shrink back 100%. The car is in a dry, but unheated pole barn with a concrete floor.

Can I go this route and then in the spring, when I’m ready to get rolling again, block the 2K down, shoot a sealer coat of primer and go to base?

Thanks for any replies in advance.

Rob
 
You should be fine. I do this all of the time. For me the key is to leave it in 2k. Then you have options of epoxy (primer or sealer), 2K primer, or 2K sealer. Where if you leave in epoxy for months, my opinion is you must spray with epoxy on top of months old epoxy to guarantee good adhesion.
 
Thanks Bartman.
Yes, I plan to leave it in the 2K.
Does the regular build tend to shrink over time? As in, is there virtue in letting 2K set up for a period of time?

Either way, mine is going to sit, as I’m running out of good weather.

Thanks,
Rob
 
Generally speaking, Epoxy does not like the cooler weather; I would do a ghost coat of epoxy rather than a heavy coat before you apply the 2K Give your epoxy some good flash time also.
 
CoronetRob said:
Thanks Bartman.
Yes, I plan to leave it in the 2K.
Does the regular build tend to shrink over time? As in, is there virtue in letting 2K set up for a period of time?

Either way, mine is going to sit, as I’m running out of good weather.

Thanks,
Rob
Click to expand...

Everything you spread or spray shrinks. It's about how much and when. I find Regular 2k, applied in 2-3 med wet to wet coats is done shrinking in a couple of days. If I know I have time to let it sit, I'm not too picky on flash. If I'm concerned that I need to do it quickly, I keep the coats lighter with longer flash, therefore less shrinkage. So a lot of shrinkage is how it is applied and flash. Longer flash is actually your friend on primer for faster working and delivery with less shrinkage. After a few days, it doesn't matter, it's pretty much done.
 
I am probably in the same boat. Question I have is DO NOT start block sanding the 2K since it will sit in 2k for months. Is it better to just leave it in un-touched 2K. I do not want to sand down to Epoxy or even worse metal and then leave it sit or HAVE to heat the building just to apply another coat. Then when it gets warmer just start block sanding what is there or would I have to reshoot more 2K primer.
Hope this makes sense.
 
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