Epoxy shelf life

[JR4 Motorsports]

I read the thread where you said to ditch the activator at 3 years, but what about the other part? how long for that?

John

 

[Barry]

Not really saying to ditch activator then, as it depends on how it was stored.

The part A if can is flipped over about every month, to keep from settling, could be forever.
What kills part A is if settling gets to hard and can't be mixed back in.

 

[JR4 Motorsports]

Part A is still well mixed, part B is 3/4 gallon full, not really dark though.

 

[Barry]

Test a little, should be just fine.

 

[JR4 Motorsports]

Test a little, should be just fine.

What would be the pass/fail indication? not hardening?

thanks

 

[Barry]

Yes, just mix a little spray two coats and check in a day and then two days to see how the hardening is progressing.

 

[JR4 Motorsports]

Thanks

 

[JR4 Motorsports]

OK
Shot some epoxy on Saturday. I had a sheet metal part for my Mustang hanging around and used that as my test and checked at various times. 6hrs, 18, 27, 34, then 55 hours. What I did was use Solvent based W&G for the initial cleaning , then water based. There was a sticker for the part number and manufacture on one side and you can see the disastrous results of that.

So picture 1:


the scrapes were done with a flat blade screwdriver. You can see at 6 hours it was still a little soft. By 27 hours I did not scrape to metal (I tried to keep the pressure the same) By 55 hours, the scrape was very small,no sign of breaking through.


OK, picture 2 Disaster!


I think this is where the label was stuck. Unfortunately the epoxy did not stick to the metal. Even at 55 hours I could peel it off with the screwdriver.

So 2 questions. Is the epoxy still good? I think so... And what happened in the second picture? i thought I got all the residue off, but I guess not. What works best to get the label residue off?

I should add, it was a little cool for the first 6 hours or so, but above 70 for the remaining time.

 

[Barry]

It is perfect!!! Nice test job!!

 

[JR4 Motorsports]

It is perfect!!! Nice test job!!

Great!! Love this stuff!!

What about the peeling epoxy? What is the best way to remove the sticky labels?

 

[Bob Heine]

What is the best way to remove the sticky labels?

Not sure if it's the "best" way but I use WD-40 to remove sticker glue. Then W&G remover to get rid of the WD-40.

 

[Senile Old Fart]

The best sticker remover I have found is either 3M adhesive remover, or Ronsonol Lighter fluid (Naptha)

Neither one leave a silicone like some of the others do.