What Happens When You Mix in Too Much Hardener to Primer
View Total Version : Primer mistake, at present what?
RonBYell
01-05-2009, 04:49 PM
Just went to PPG online to pull a product data sheet to cheque on how I deal with epoxy primer that's been on for awhile. I'yard getting fix to spray 2k over it.
Well, here's the problem. I was "told" and sold Store line epoxy primer to be mixed at a 4:one ratio. One gallon epoxy primer, 1 qt catalyst/hardener. And, that'south how I sprayed it.
In reading the PDS, mixing is said to be two:1. It'southward been on in some parts for a month or more.
Since I have to scuff and recoat earlier spraying 2k over it, do I need to take any precautions or exercise annihilation else to make certain I take adhesion and correct surface preparation?
thanks,
Bob K
01-05-2009, 06:12 PM
I would telephone call PPG tech support on that one. Information technology is there product and they could give you the best advice on that issue.
Bob K
jimmo4life
01-05-2009, 07:57 PM
Calling PPG is probably a good idea. If you lot check out this site too http://chemicalforums.com, their are chemists their that can likely tell you what kind of problems to expect. They've helped me out a time or 2.
RonBYell
01-06-2009, 10:18 AM
Lesson learned....
Don't trust the sales person no matter how knowledgeable they seem!!
PPG tech support recommends that the under catalyzed epoxy primer be stripped and reapplied with the right mix.
Yea! But what i wanted to exercise, strip epoxy primer. Bad. very bad.
All Dry
01-06-2009, ten:twoscore AM
PPG tech support is probably going to err on the side of caution,But Imo the fact that it did cure says there was enough catalyst,I would put some masking tape on the surface in a few spots pressing it downward very well and pull it up to run into if the adhesion is good,I would bet it is.Mike
showcar
01-06-2009, 11:32 AM
I'd endeavor duct tape.
I'd try duct record.
The trouble with some duct record is that it can leave some of the adhesive on the surface. Masking tape doesn't pull hard enough for me and then I use a practiced quality clear packing tape which pulls hard and comes off cleanly.
RonBYell
01-06-2009, 02:12 PM
Definately worth a try with the tape idea. Information technology seems to have stuck very well.
Dennis Northward. Schmidt
01-06-2009, 03:34 PM
PPG Tech Back up is merely roofing their ass. Fact is that the just thing that happened is that the epoxy primer, which takes a adept calendar week to cure using the proper mix, probably took a month to cure using the 1/2" mix. So what, you waited that month so now yous're adept to go. The packing tape exam is a skillful one so exercise it but well-nigh certainly you're in fine shape. You lot're nuts if you strip this off.
Harry Phinney
01-06-2009, 03:40 PM
While the primer got hard and may have decent adhesion, you can be absolutely certain that it does not have the chemical composition intended by PPG. It may piece of work, but it is guaranteed to non have the same concrete properties as if it were properly mixed. Information technology likely does non have the same level of chemic resistance equally if it were properly mixed and may react desperately depending on what is applied over the top of it. It may not have the same level of (im)permeability to water as if information technology were properly mixed. It may non have the same elastic and forcefulness properties to deal with the substrate and itself expanding and contracting with temperature. Simply be aware that you are rolling the dice if yous leave it on in that location.
Harry Phinney
jimmo4life
01-07-2009, 07:26 AM
I was getting a bit curious myself & made a post for you here, http://www.chemicalforums.com/index.php?topic=30554.msg116194#new. These guys are pretty familiar with epoxy resins and the manner they react. Information technology looks like a few guys have responded with information technology will either cure slowly or not fully cure.
RonBYell
01-07-2009, eleven:00 AM
Thanks to all. I did the record test yesterday afternoon in v different locations. Not a spec of paint came upwards, even dust and I used duct tape.
Here's my rationale, tell me where information technology's incorrect. PS..this went on bare metal, sanded in nigh all locations with eighty grit.
Since I've got to scuff and recoat with epoxy before spraying 2k due to being beyond recoat window of 3 days, I'yard not going to remove it. I'll scuff, give it a light coat of epoxy and and then later on flash fourth dimension, spray it with 2k. I intend 2 coats minimum of 2k.
After it'southward blocked, it's going to have to be sealed anyhow. I'll seal information technology then come back, finally with the paint.
Does anyone see problems with this?
Serge
01-07-2009, 12:00 PM
If you tin can rub it off easily with reducer on a rag then it has not crosslinked at all...if it does non or if its existent difficult to get color on the rag and then it has crosslinked...
Any mode, I think not much volition happen if yous simply give it a skilful scuffing and shoot one skilful moisture coat of proper epoxy on it then proceed with your 2k wet on wet...
Its no worse than having a 1k primer on at that place....
Jayson M
01-07-2009, 07:29 PM
That is like edifice a house on sand,your weak foundation will fail.strip it and start over or exercise information technology again in a few years.
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