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RuzzTMan · 08-25-2009, 04:58 AM

So, I've gotten around to restoring the Frunk & Trunk on my '85 Mk1 to new condition which meant removing all of the padding that is in there. I knew there was some rustiness but thought it was only surface. As I sanded it down for priming, I got some tiny rust-through holes in a couple areas in the Trunk. The Frunk is OK. I am in the process of treating the base metal/rusty areas with Rustoleum and plan to paint over that with Duplicolor truck bed coating, thick enough to prevent any new rust from ever forming.

My first question is, should I put the old spongy trunk pad back in there? I am certain that it is what caused moisture to sit against the metal long enough to cause rust in the first place, but with the bed liner painted on it should not be a problem any more. It does provide cushion for the carpet that goes over it and might possibly reduce heat from the exhaust components directly under it. Also thought about lining it with Dynamat as an added measure.

Second question, since the rust-though is right above the muffler area, what undercoating should I use on the underside that can stand up to the heat of the muffler/cat?

Any ideas?

08-25-2009, 04:58 AM	#1 (permalink)
RuzzTMan 85 AW11 NA Join Date: Jun 2009 Location: Los Angeles Posts: 51 Thanks: 25 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	Trunk & Frunk Padding Can Cause Rust So, I've gotten around to restoring the Frunk & Trunk on my '85 Mk1 to new condition which meant removing all of the padding that is in there. I knew there was some rustiness but thought it was only surface. As I sanded it down for priming, I got some tiny rust-through holes in a couple areas in the Trunk. The Frunk is OK. I am in the process of treating the base metal/rusty areas with Rustoleum and plan to paint over that with Duplicolor truck bed coating, thick enough to prevent any new rust from ever forming. My first question is, should I put the old spongy trunk pad back in there? I am certain that it is what caused moisture to sit against the metal long enough to cause rust in the first place, but with the bed liner painted on it should not be a problem any more. It does provide cushion for the carpet that goes over it and might possibly reduce heat from the exhaust components directly under it. Also thought about lining it with Dynamat as an added measure. Second question, since the rust-though is right above the muffler area, what undercoating should I use on the underside that can stand up to the heat of the muffler/cat? Any ideas?