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Actually I used the stuff from Eastwood, the black sticky material covered by a heavy aluminum layer, all about a 1/8” thick.
I had a hard time installing this product nice and pretty like they do on TV and in the pictures. So many contours and angles, it was tiring to use a roller or tools to iron out the wrinkles and where I pieced in spots with waste cuts doesn’t look so nice as I would have liked. I made sure no air pockets, or any overlapping and I tapped any exposed edges with aluminum tape. I’m not going to add to this layer with anything else. Will I have any fit problems when it comes time to lay the carpet with the jute padding?
I didn't have any significant issues reinstalling the carpet. A couple of areas needed extra attention but it all eventually went back into place just fine
I used the FatMat from Eastwood, with the Reflectix over that in our 71 coupe. I had to trim the jute padding on the back of the carpet at the push-in carpet retainers on the back wall, the wheel wells at the footman loops for the T-top straps and shoulder belt bolts, and at the dimmer switch & gas pedal. Other wise, the carpet laid in very nicely.
That thin of layer i wouldn't worry too much about stuff fitting, any short fasteners about only issue and a quick trim of the pad usually does the trick.
New pad and carpeting can be a bear to get to fit right though...
When I did my 71 I did the Eastwood stuff as you did. Then the foil on both sides insulation with the 3/8" fiber in between the foil. Then new carpet. Zero heat in the cabin. One thing I like to do is once you've put in the Dyna Mat type stuff is glue the insulation to the Dyna Mat and then glue the carpet to the insulation. I think the glue makes the carpet follow the contours better. I use the spray can 3M adhesive.