Acylic or Glue
- Thread starter montmill
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jttheclockman
Member
Have to ask why are you painting the tube and the blank to begin with? It is wood blank. Skip the black paint or at least skip it on the tube. Maybe I am missing something from your explanation.
montmill
Member
It's a worthless wood cast. Alumilite slow in the middle of the blank.
jttheclockman
Member
So I am guessing you will fill in the crack with colored resin? If that is the case then just do not paint the tube.
Woodchipper
Member
That happens to all of us at one time or another. My luck is: Just the last "touch up this place."
No need to paint the tube or wood. And as mentioned, scuff the tube with 150 sandpaper before gluing the tube in place.
No need to paint the tube or wood. And as mentioned, scuff the tube with 150 sandpaper before gluing the tube in place.
so I have a different question on this.... perhaps two. This photo looks like the glue fractured and not your epoxy
1 - does the piece that broke off show glue on the broken chunk still?
2 - what kind of wood is involved in this cast? Usually epoxy fixes most ills. Perhaps its too oily or something?
The only other question or thought I've got is to make sure you look down the hole in the blank when getting the glue applied across the hole. Part of me wonders if this blank was missing some glue and fractured because nothing was holding it on to the tube?
1 - does the piece that broke off show glue on the broken chunk still?
2 - what kind of wood is involved in this cast? Usually epoxy fixes most ills. Perhaps its too oily or something?
The only other question or thought I've got is to make sure you look down the hole in the blank when getting the glue applied across the hole. Part of me wonders if this blank was missing some glue and fractured because nothing was holding it on to the tube?
montmill
Member
I want to second the thought that the tube doesn't look very roughed up. Further, the scratches on the tube seem to be mostly/only radial. When you rough up the tube, you want to use something like 180 grit sandpaper, and really get it moving around. You want scratches kind of every which way, so that you support grabbing power in all directions. When I am scratcing up my tubes, I not only twist the tube, but also move it around laterally as well, and try to make as many motions at once as I can. The end result is that the tube looks as much white as brass, due to the way it scatters light. Your glue should bond better that way.
As for acrylic. I don't know that there has really been any particular study on this, but my own anecdotal evidence, which now spans some years, tells me that acrylic paint DOES weaken the bond. I think that should go without saying, really... Its a layer of its own, that is not a glue, that separates the thing being bonded from the thing its being bonded to (tube to blank).
What I have started to do, is to tint or otherwise pigment my epoxy itself. You can actually use a small amount of acrylic for this, or there are other options. You don't want too much pigment in the epoxy itself, and you don't generally need a lot anyway...enough to make it mostly opaque though.
This provides the coloring to hide the brass color of the tube, but ensures that you have bonding agent fully in there between the tube and the blank to make sure the two are in fact actually bonded to each other.
As for acrylic. I don't know that there has really been any particular study on this, but my own anecdotal evidence, which now spans some years, tells me that acrylic paint DOES weaken the bond. I think that should go without saying, really... Its a layer of its own, that is not a glue, that separates the thing being bonded from the thing its being bonded to (tube to blank).
What I have started to do, is to tint or otherwise pigment my epoxy itself. You can actually use a small amount of acrylic for this, or there are other options. You don't want too much pigment in the epoxy itself, and you don't generally need a lot anyway...enough to make it mostly opaque though.
This provides the coloring to hide the brass color of the tube, but ensures that you have bonding agent fully in there between the tube and the blank to make sure the two are in fact actually bonded to each other.
dschem
Member
Acrylic paint is water-based, so yes likely it weakens the epoxy. Ideally, if you are having breaks, you may want to use alumalite dyes or an equivalent. I also find it's best to spray paint the inside of the blank with some rustoleum, especially clear blanks as it comes out much smoother.
montmill
Member
Thank you so much. I was wondering about the acrylic. I was thinking along the same lines as Jon in that I wasn't gluing the brass to the blank, rather gluing the acrylic to the blank. I'll try rustoleum spray and mixing a bit of color in the epoxy itself.
dschem
Member
Just be aware that you might need to go up to the next closest drill bit as the paint can make it too tight a fit. I might suggest trialing with a scrap blank or two before a good one.
I just reread my response and it makes no darn sense...
First line should have been "it looks like the paint fractured and not your epoxy" Sorry about that. Epoxy possibly bonded to the pain and not to the actual tube therefore maybe it "broke the paint off" because that was the weaker bond location? Not sure but it has me wondering
montmill
Member
My wife found the broken off piece and it has the black acrylic on it so as you said, the acrylic let loose from the brass. Makes sense because the glue was on the acrylic, not the brass. I've super glued it back on and it fit nicely. Doubt anyone will be the wiser as it'll be under the pocket clip. If I complete it without buggering anything else I'll post a photo. Again, thanks for your responses.
it's only lost if Mom can't find it...
Glad you found it and that the piece went back on
gbpens
Member
From the positionof the break it looks as though the mater extends slightly beyond the tube. If so, the pressure on the material from the bushings is your problem regardless of painting or gluing or scuffing the tube. Make sure you trim the material down to the tube.
Woodchipper
Member
Good idea. Had a couple of blanks chip when assembled. Now I lightly rub the end of the blank in figure 8 pattern on 120 sandpaper.