Getting epoxy in a hairline crack
As the title states. Does anyone have a good way to get epoxy into a hairline crack? I have a vertical stab that I need to do. My first thought is to heat it so it's very thin, but was wondering if anyone had a better way, or a sure way to make sure it's deep enough for good coverage.
Thanks for any help. |
Dealt with it by slightly reducing Zap finishing resin with denatured alcohol , use a piece of G-10 as a squeegee . Let gravity do what it does .
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Ca would be better for a hair line crack I would think, but using something like a game card or thin credit card and go back and forth over the crack would force the glue in. Then clean the area of excess being careful to not get anything in the crack.
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The problem I have with ca is that it has a mind of its own about where it goes and runs and its non foregiving .
We've all likely had that experience . |
Originally Posted by jetmaven
(Post 12347439)
Dealt with it by slightly reducing Zap finishing resin with denatured alcohol , use a piece of G-10 as a squeegee . Let gravity do what it does .
I would heat the epoxy slightly and work it in back forth with a squeege as suggested. Use at least 30 minute epoxy to give you enough working time... Bob |
My experience with reduced finishing resins has been excellent , it cures as it should , sands well and does not become
gummy . |
Thanks for the suggestions. I should have mentioned it has a foam core, so CA isn't really an option. I can flex it enough to open it about 1/16" at its widest and it tapers down to little or no opening on each end. Looks like there may be several ways to do it, just need to work it in.
Thanks again for all your help! |
Use medium viscosity Foam Safe CA.
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If you can flex like that, use a syringe and force it into the crack, when you relax it the excess will ooze out and then just clean up.
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Originally Posted by big fred
(Post 12347465)
If you can flex like that, use a syringe and force it into the crack, when you relax it the excess will ooze out and then just clean up.
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Originally Posted by jetmaven
(Post 12347457)
My experience with reduced finishing resins has been excellent , it cures as it should , sands well and does not become
gummy . If you thin 5 minute epoxy like that, you will find that it does not cure hard because the solvent doesn't get out before it cures. The same thing happens with a longer curing epoxy if thinned in an application where it is not well exposed to the air for the solvent to evaporate. Also, I'm not sure that finishing resin is the best adhesive for a structural repair... YMMV Bob |
Originally Posted by Eaglepilot2
(Post 12347478)
I actually thought about that, but how difficult is it to get it in the syringe, and what kind of syringe would you recommend? Just wondering if I can draw epoxy into the syringe.
To get the epoxy in the syringe, just leave the needle off and pull it into the syringe then put the needle on it an push the air out. Try and get syringes that do not have the hub lock, they come both ways. |
I'd just open the crack and glue it with hysol. The small tips would probably force it right into the crack.
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I'd use hysol as well.
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Use some 30 min epoxy. Heat it with a momocoat blower. It will become waterlike. It can then be put in a syringe and injected into the crack. Be sure to do this with of lots of ventilation.
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Thanks for all the suggestions. I'm sure I'll be able to get it done after all your help! Guess I'm headed to the farm supply store!
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What is the structural component of this vertical fin?
If the structure is the foam then you can just get some epoxy in there and it will be strong as new. If it is foam with a fiberglass covering then just butt gluing it back together is not going to be strong enough. You can heat most epoxies to make then thinner, heat will also dramatically reduce pot life so be ready, your 30 minute epoxy once warmed up may only give you 5 minutes. |
Its balsa sheeted foam core and glassed. Once glued, I do plan to reinforce the joint with some cloth and the usual blending for repaint.
Thanks |
If you are conna reinforce it with cloth and repaint why are you worried about the CA getting everywhere? just CA it, reglass it and be done with it. Could be lettin' the paint dry by now......
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Originally Posted by Terry Holston
(Post 12347633)
If you are conna reinforce it with cloth and repaint why are you worried about the CA getting everywhere? just CA it, reglass it and be done with it. Could be lettin' the paint dry by now......
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I would use Hysol.. mix it with 20 percent more hardner.. then dilute with dn alcohol.. use a rubber glove so you won't get skin oil on it and work it in.. then wipe clean with alcohol
place a fan on it, no heat.. come back tomorrow.. it will be hard and solid.. BTDT |
you get syringes at any pharmacy I use them for work on plastic models.
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Originally Posted by gooseF22
(Post 12348105)
I would use Hysol.. mix it with 20 percent more hardner.. then dilute with dn alcohol.. use a rubber glove so you won't get skin oil on it and work it in.. then wipe clean with alcohol
place a fan on it, no heat.. come back tomorrow.. it will be hard and solid.. BTDT |
Originally Posted by Zeeb
(Post 12348269)
I like that hint, I've always wondered about thinning Hysol. How about using the one hour stuff instead of the 9462?
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You can also mix your epoxy,then add acetone to desired texture,(almost water thin) then apply with a fine haired brush. Then wipe of with lightly with a soft cloth.
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