I am getting back to the model rr after some time out of the field. My
question is about adhesives: I understand the uses of two main types,
plastic cements and CA adhesives. These were described recently in the
new book on structures published by the MR people. But what about other
adhesives that used to be mentioned: epoxy glues, goo formulations, or
a urethane adhesive like Gorilla glue? There probably others I have
missed. Do these find general use or is the field now dominated by the
plastic cements and the CA glues?
A lot depends on what you're trying to stick together. Most common
plastics, the plastic cements work well with a good fit. Metal to
plastic or plastic to wood, plastic to plastic, CA works. Woodland
Scenics sells several different adhesives, I've had very good luck
using their Scenic Glue for wood structures. Metal detail parts to
cast zinc body shells, CA is good. Haven't tried many others, haven't
had to. Epoxy is still as good as it ever was, just a little harder
to work with than some others.
CA also works well for putting stripped out drivers back on their
axles, if anyone else beside me is dumb enough to be trying to repair
some of the junk I am.
Hope the following comments are helpful:
a) CA doesn't "weld" plastics. Solvent cements do that.
b) CA sets by a chemical reaction. I can't recall whether the moisture
in the air kicks the reaction, or whether it's part of the reaction. But
either way, in a high humidity environment, the setting may well start
too soon, so that the cement is already partly set when you apply it to
the parts. This will of course make for a weak joint.
c) if you're using the watery CA, let capillary action draw it into the
PS: It may be that mold release agent is interfering with the CA bond to
plastic. Anybody know whether that's so?
On Thu, 15 Dec 2005 14:31:14 GMT, email@example.com wrote:
The only problem I've ever had with CA is getting something off that's
not where I wanted it. Moisture, from my experience, doesn't bother
it at all. I've really had no problems with anything I've used it on,
other than sometimes having it grab just when something is exactly
where I didn't want it. My buildings are all scratched, wood with
plastic door and window castings, no problems there, although no
problems with the white glues either, once they're cured for a couple
of days, normal humidity isn't going to bother them for a long time.
CA doesn't weld plastics like the solvent cements, it's the same
bonding as for everything else. BUT. Using CA on wood>plastic, you
run into humidity expansion of the wood, which could potentially cause
a problem as CA has exactly zero flexibility once it cures.
There are applications for each type of glue/cement, but for MRR use,
CA can be a good choice, although not always universal. For my
structures, I've gone mostly to Woodland Scenics "Scenic glue", it
grabs on fast enough yet gives a little working time to correct
The local Dollar Tree store has been stocking Pacer Super Glue, three
2gm tubes for a buck. I've found this practical, having most of a
bottle of Zap going to honey before I use it can get pretty expensive.
The smaller tube, I generally get most of it used before it plugs so
bad it's useless. Epoxy for high strength apps, also good for filling
unwanted holes or just building something up to carve and file to
I'm currently working on putting Cary boiler conversions on an IHC and
Rivarosi pair of pacifics, using mostly CA, but where repairing
damage, I got the chassis for el zip, using whatever seems to be
called for. There is no one universal cement for all purposes, small
amounts of a few different ones give some flexibility of choices.
o Contact cement: good for bonding unlike materials, like cloth to metal
(but only where you can bond without repositioning)
o Wood glue (Elmer's, etc.) for bonding wood/paper/paperboard
o Rubber cement for paper, sheet metal, etc., where a super-strong bond
isn't needed (can be repositioned before bonding)
o Goo: bonds pretty much anything to anything, with a flexible bond
o Shoe Goo: same as above (cheaper, too)
o Duco cement: quick, easy bonding of paper, plastic
o Hot-melt glue: very quick, temporary or removable bonding
You can do most of your adhesive shopping away from the hobby store and
pay a lot less.
God willing, the many crimes of the Bush Administration
will eventually be printed in a nice leatherbound,
Phenoseal. Comes in tubes for the caulking gun. Found at Home Depot or
hardware stores. Dries clear and will bond flex track ties down to
Model Engineering plastic viaducts.
Bathtub caulk. Excellent for securing ballast weights inside boxcars.
Dries to a rubbery material and doesn't let go of the weight even if the
car is dropped.
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