#1
|
|||
|
|||
Weld Through Primer: Issues
In working on the Duetto floor boards I used weld-thru primer wherever necessary. At first, I was using Spray Max 1K and had NO issues using my spot welder, or MIG plug welding.
AAAAWeTh1.jpg However, I ran out of Spray Max 1K and switched to what I thought would be a better product, SEM's Weld-Thru Primer and I began to have many issues with making strong spot welds, and even plug welds. The SEM product also was grainy, like it had very fine sand in it. AAAAWeTh2.jpg Can anyone recommend a weld-thru primer that's better than Spray Max 1k? Any comments in general about using weld-thru primers?
__________________
Bill Longyard Winston-Salem, NC |
#2
|
||||
|
||||
NO weld through primer is best.
Better off using epoxy primer, then scraping out where the rosette weld will be with a flattened out drill. Nothing in a spray can can match the adhesion urethane has. I have seen that garbage peel right off a well prepared surface, Marty
__________________
Results = (Effort X Determination2) + Time |
#3
|
|||
|
|||
You're killing me, Marty! I thought I was doing it the right way.
__________________
Bill Longyard Winston-Salem, NC |
#4
|
||||
|
||||
Bill, epoxy the two sides, let it cure, then plug weld. I have done the same with the spot welder, let me dig up some more pics..
Spot welding: Quote:
Quote:
Back to the weld through primers, I believe they operate on the premise that the heat liquefies the paint around the perimeter of the weld where once the weld starts cooling the WTP seeps around the weld to seal it. All that aside, I agree with Marty, there is no way in my mind that an aerosol paint can match the endurance of an epoxy.
__________________
Robert Instagram @ mccartney_paint_and_custom McCartney Paint and Custom YouTube channel Last edited by MP&C; 07-21-2015 at 09:21 PM. |
#5
|
|||
|
|||
Yet another great tip Robert - now I have a use for those slightly rust pliers in the junk tool box! Pays never to throw anything away
__________________
Richard "I know nothing. I from Barcelona" (Manuel - Fawlty Towers) Link to our racecar project https://www.facebook.com/pages/Elan-...ab=public&view |
#6
|
|||
|
|||
Robert,
I've drilled out a few spot welds and I've dealt with plug welds and WTP chemistry for a long time. I have to say that your "end mill drill" combined with the end milled pliers suggests "months of heavy drinking" to come up with. Nice clean approach to a nasty problem. Thank you. Foo cans are NO match for real chemistry delivered by real paint guns - no way Hose A !
__________________
Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#7
|
|||
|
|||
Absolutely outstanding Robert. Thank-you so much!
__________________
Bill Longyard Winston-Salem, NC |
#8
|
|||
|
|||
Robert has some Bloody good ideas.
What a Champion.
__________________
John EK Holden V8 |
#9
|
|||
|
|||
But To answer your question Bill, I use the U-Pol #2 Weld through Copper primer, works great. The one in the green can.
The Epoxy I use burns like No Tomorrow... Even when plug welding.
__________________
John EK Holden V8 |
#10
|
||||
|
||||
John, the epoxy I had been using (as shown above) was House of Kolor, and the extent of the "damage" from heat seemed to be limited to discoloration. I have had some plug welds that turned the area even darker than that shown above, and after letting the area cool completely I did a fingernail scratch test, with no marks left in the paint and no loss of adhesion whatsoever. I have some upcoming plug welds using SPI epoxy, so I'll be sure to update results with that primer.
__________________
Robert Instagram @ mccartney_paint_and_custom McCartney Paint and Custom YouTube channel |
Thread Tools | Search this Thread |
Display Modes | |
|
|