I have been welding up all the holes in the engine compartment on my 92 mustang. I posted a few pics of what I have done so far. What I am wondering is do I need to apply a thin layer of kitty hair to prevent water from getting in from the backside and bubbling the putty? And if I should use kitty hair is there any reason I can't apply it to the back side of the welds? Thanks for your help.
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