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Re: Question about order or operations
You could use it under mats inside if you like, no harm in that I suppose.
A good paint job with epoxy and urethane topcoat gives a very good protection and with a good mat, you shouldn't get much debris under it.
In my opinion, I wouldn't bother spending the money on that. My resto is not getting any of the undercoating or in cab products you're thinking of and I've been in the body shop supply business for over 20 years and am familiar with most products offered.
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