Picked up a gallon of Fluid Film and the Fluid Film Pro Gun to spray inside the frame.
Started by putting tape over all of the holes:
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Here is the pro gun with one of the extension nozzles:
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This stuff is thick! I had it in the house at 70 degrees... Took a lot of stirring and I even started blowing my heat gun into it as I stirred to get it to soften up. Eventually got it pourable. Sprayed it at about 100 psi at the gun.
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Put about 1/4 of the can into the frame. Garage now smells like a barnyard.
We also got the Hardtop out and replaced the bottom seals:
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And got the doors on:
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As it sits, it is about 1" higher in the rear, but it only has a few gallons in it, we may add some spacers up front.
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My hours of calculating backspacing and tire widths for tire stickout, worked out well. Tire stickout past the wider OEM flares (Rubi and Sarah) is perfect at about 1":
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