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Old 05-14-2013, 11:40 AM
tech69 tech69 is offline
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SEM multi purpose panel adhesive

so we got a showcar vette that came a few months back with a bad SMC bumper. The old man used The SEM multi purpose panel adhesive on the front and back to stiffen it up then piled on kitty hair on top. It bubbled. To fix he just feathered the area and added more panel adhesive. not sure if he's gonna kitty hair it again but I think it's gonna fail again if he does. Shouldn't he have strengthened this from the back with perhaps the panel adhesive and maybe a piece of sheet metal to strengthen it? I would think a polyester based filler would have issues with SMC AND the panel adhesive caked all over the bumper. Seems like your 3m rigid parts repair would have worked on top with panel adhesive to stiffen it up on the back side and only used as a backer.

So my question is, is there huge issues with an SEM multi purpose panel adhesive(epoxy based) used as a filler of sorts over SMC? I would think the bond to the SMC would be good but top coating AFTER can be tricky on top of expansion and contraction rates. Just thinking maybe it's safer to use a 3M rigid parts repair over the SMC instead of a panel adhesive and use panel adhesives as only a backer, NOT something under the surface.

My next question, what SMC filler do you recommend? and can you top coat it with a little flexible filler for finishing touches? We have 3m Rigid parts repair material at our local jobber and it's epoxy based but can it top coated with a little flexible filler?

not trying to be the shop superhero here but I've kind of been waiting for this to happen cause I cringe when I see old guys throw kitty hair over everything. Just trying to hint at some things in hopes this doesn't come back again. I tried to explain it in a nice way but talking to old guys with more experience than you isn't easy when they're wrong.
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