I see builds sometimes where it appears people have added parts to a kit they've already primed, and sometimes read accounts that seem to indicate some glues will adhere to primer, but I had always presumed it would not. I'm reasonably sure regular model cement wouldn't work, but what about CA and/or epoxy?
I don't mind sanding or scratching primer away from mating surfaces, but if I don't need to do so, sometimes it would make things easier ...
Qapla'
SSB
Ridiculously stupid question -- will glue stick to primer?
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Ridiculously stupid question -- will glue stick to primer?
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-- Michael J. Nelson, Mike Nelson's Mind over Matters
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Model glue or CA will soften paint causing the joint to fail. If you have a part that won't undergo much stress you can use 5-minute epoxy to glue it on without hurting the primer. Best to just scrape off the primer before gluing if possible.
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I never do it these days. My experience tells me that if I do that I will end up with a terribly weak joint.
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Like just about everything else in this hobby, the answer is "it depends".
If you are glueing on a small part or something that shouldn't need to be held well, then any number of glues will work to hold the part to a painted surface.
If you need to part to take some knocks or some loads, then make sure you have all the paint off the surface first and this includes Mr. Surfacer.
Fundamentally, the bond between paint and plastic/resin is much weaker than that of pretty much any of the adhesives (other than white glue). If you need strength, scrape it off. The stronger it needs to be, the more unpainted surface to surface contact there needs to be.
Paul
If you are glueing on a small part or something that shouldn't need to be held well, then any number of glues will work to hold the part to a painted surface.
If you need to part to take some knocks or some loads, then make sure you have all the paint off the surface first and this includes Mr. Surfacer.
Fundamentally, the bond between paint and plastic/resin is much weaker than that of pretty much any of the adhesives (other than white glue). If you need strength, scrape it off. The stronger it needs to be, the more unpainted surface to surface contact there needs to be.
Paul
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Okay, that was what I always thought and the way I always worked, but I had seen some people who appeared to have made it work. Sometimes it can be a little inconvenient to have to remove primer, but I guess I'll keep doing it. Thanks for the replies!
Qapla'
SSB
Qapla'
SSB
“The entire concept of pessimism crumbles the moment one human being puts aside thoughts of self and reaches out to another to minister to her suffering. The experience of either person can neither be denied nor adequately explained by a negative philosophy.”
-- Michael J. Nelson, Mike Nelson's Mind over Matters
-- Michael J. Nelson, Mike Nelson's Mind over Matters