sem 39897 metal bond for patch panels?

O

OJ86

Promoted Users
Ok. My buddy wants these holes filled in his doors where someone added aftermarket mirrors at one point. I really don't feel like welding and warping the pamels. Could I get away with using this sem product and glueing small patch panels from behind and then just puting a light coat of filler on top?

http://www.semproducts.com/product-catalog/repair-materials/dual-mix/adhesives/patch-panel-adhesive/

Here are the holes:
CAM00776.jpg


CAM00781.jpg
 
I have done it in the past. Only problem is I cant tell you how long it will last, as I never kept one more than a few months.
 
I have done that many times and it does last, as long as the back side is sealed up too. Only problem is it can telegraph through with temperature changes.
Most times it's not very noticeable but at times you can see where the holes were
when sighting down the panel.
 
Would sem 39537 work also? Its another sem weld bond adhesive. Only reason I ask is because I have some of that at work already
 
A panel adhesive like that one would be an excellent way to
glue the patch with.
It'll seal it good too.
 
According to the tech sheet, 39897 is for patch panels and has a working time of 5-10 minutes
39537 is for panel bonding and has a working time of time of 45-60 minutes.
 
This should be perfect then. I'm just glueing little 2x2 pieces on the back. As always, thsnks for the replies everyone!
 
Just remember the holes will telegraph. Won't really be as noticeable on white but it will be there. That would be a pain to go back and weld if your buddy isn't happy when it is sitting out in direct sunlight.
 
I'll try to bevel out the edges abit and maybe that will help a little. This is just a spare truck for him.
 
I have heard (and don't know myself) that if you have
small holes and fill them with the same adhesive instead of
filler that they won't telegragh.
I'd like to know if that's true.
 
jcclark;32799 said:
I have heard (and don't know myself) that if you have
small holes and fill them with the same adhesive instead of
filler that they won't telegragh.
I'd like to know if that's true.
Click to expand...

That's what we have done for years is to glue a patch on the inside and let the glue squish out the hole on to ground metal...a little epoxy on top of the sanded adhesive, then small amount of filler and go...course only on a daily driver type of vehicle, which this truck seems to be

- - - Updated - - -

jcclark;32799 said:
I have heard (and don't know myself) that if you have
small holes and fill them with the same adhesive instead of
filler that they won't telegragh.
I'd like to know if that's true.
Click to expand...

That's what we have done for years is to glue a patch on the inside and let the glue squish out the hole on to ground metal...a little epoxy on top of the sanded adhesive, then small amount of filler and go...course only on a daily driver type of vehicle, which this truck seems to be
 
Quick update. I ended up welding the holes in. There was one hole located on a channel on the top of the door that i wasnt able to get to to sand the back to insure a good bond. Figured i had the welder out might as well just wepd them all up.
 
Interesting discussion, on a Mustang forum I visit some guys were talking about using panel adhesive to bond quarter panel patches. What are all the cons to doing this? I don't know enough to disagree, but it just seemed to be the wrong way of going about the repair. Not planning on doing this for my vehicle, again just for curiosity's sake.
 
I know of a body shop that uses panel adhesive to fasten
complete quarter panels. the new adhesives are quite good and
more and more shops are turning to them instead of welding.
It eliminates the warpage from welding and has advantages
for rustproofing too. I have no doubt it will last and be strong enough
after what I've seen.
 
Thing is, panel bond was not really designed to be used that way Raymond. Tensile strength has been proven to be more than spot welds, but the stuff was really designed to be used in conjunction with spot welding. Most manufacturers give you a diagram now on where you need to put the panel adhesive and where you still need to spot weld.

It isn't really designed to use as patch panel work. Will it probably hold up? Maybe. Keywords probably and maybe, not something you want to say on even a decent resto. It is an epoxy designed for bare metal. But when using it as a patch, it will show on you down the road. Depending on the products you use under and/or over it, the expansion and contraction over the years COULD cause some hairline cracking. If you are using quality products over it, then why waste the time to do an inferior repair in the first place?

At the end of the day, using it solely as an adhesive for patches instead of welding is an inferior way of doing it. But probably fine if you are repairing a 1990 honda civic beater, as long as the repair isn't structural, or as Ryan was planning on doing here before welding.
 
Panel adhesive is stronger than spots welds in some cases, but not all cases, and thats why they recommend spot welding certain areas. Its not that it will fail in normal use, its for safety in case of an accident, and they also recommend welding in areas that will telegraph the seams.

A full frame car is not so likely to lose much in the way of safety in the case of an accident, due to bonding adhesive. IMO
 
Due to many issues with the trucks paint and its low mileage we decided to just do a complete on it.






I'm too nice sometimes
 
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