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17 OB 2.5i
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Discussion Starter #1
I got a Gen5 OB that I'm planning to increase the soundproofing (layering MLV/CCF under carpets), but I am wondering if anyone has used the Duplicolor Rubberised Undercoat spray in the wheel wells ... or an equivalent?

The wells, in the Gen5 OB, are a thin plastic that sound hollow and would be an acoustic conductor, so I would have thought adding a deadening layer should help quite a bit.
 

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I used the 3M rubberized spray. One coat over what was already applied by the factory plus the underside of the spare tire well. Reduced sound level inside cabin. Now I only get a low swoosh sound. Not sure if it's the tires or road noise. Need to decide what to do next.
 

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17 OB 2.5i
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42 Posts
Discussion Starter #5
I've been trawling through some youtube videos and see people applying it prior to winter conditions (salt/grit etc). They just give it a good APC/scrub down before applying it, or touching up.
Considering it's just a smooth plastic, and not a textured coating, as long as there's no residual grime over the base plastic it shouldn't have any issue with the undercoat having a good surface to adhere to.

My car is still pristine (low mileage and the wheel wells are regularly waterblasted), so I have less concern with the application and more to see if it makes any difference acoustically, or otherwise.
 

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2021 Outback Onyx Edition XT
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I think the design has changed, but I have to go through the wheel wells you're talking about to access some side marker/position/low beam bulbs. If you spray this and coat it, you could be sealing it off, right? Just something to consider.
 
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