Poly flex underneath bodyfiller (Platinum Plus) and vice versa? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-01-2011, 04:50 PM
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Poly flex underneath bodyfiller (Platinum Plus) and vice versa?

So I'm blending some side scoops into my 67 Mustang, and for the transition, I'm using polyflex to give it a little give.. Now the scoops have been build up with short strand, and on the body body I'm using platinum plus. So there will be different layers of differing products.

Any problems with this since Polyflex has a little give and body filler doesn't have much? The fiberglass scoop to metal transition will only be polyflex, but then the polyflex will overlap the platinum a little bit, and vice versa.

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Old 06-01-2011, 11:44 PM
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you should use cross bonding ahesive over the seam and poly flex on top. I'd remove any filler so the cross bonding adhesive is adhering to metal( or primed metal) and fiberglass. Then I'd use poly flex to feather out the seam. You probably won't get any flex on the scoop so poly flex won't matter but it's only for the transition to smooth it out and account for the differing expansion rates. I think fusor makes a couple cross bonding adhesives...some require primer over metal to plastic...some to bare... but not sure about fiberglass. Look into their cross bonders.
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Old 06-02-2011, 10:42 AM
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I am using Fusors cross bonding adhesive, but I'm concerned about the blending aspect of it.
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Old 06-02-2011, 10:51 AM
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poly flex is perfect then. You're doing it right. good job!
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Old 06-02-2011, 01:37 PM
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Wouldn't make sense for me to do them wrong, now would it?
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Old 06-02-2011, 03:48 PM
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even the short hair on the scoops isn't a bad idea. You really handled it well. Lots of guys would put the short strand on the seam of that, which is even harder than normal filler.
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Old 06-02-2011, 03:56 PM
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I used the short strand to build up the waves on the scoop that resulted from it being screwed (While the fusor was hardening). And I masked the edge where it meets the metal..

So I have short strand on the scoops, and 3M platinum plus on the metal of the car.. And then polyflex on the seam, overlapping both.. Won't be a problem you don't think?
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Old 06-02-2011, 10:25 PM
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might be because the crossbonder is adhered to it. Not sure though. The manufacture procedures will tell you something about that.
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