not nearly finished, but the basic walkthrough...
started removing the old carpet, seats, side panels, trim, etc..
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the floor was cleaned & the interior surfaces were all vacuumed a couple times and wiped clean with acetone to make sure everything would stick properly. I also scraped the plastic sidepanels with a paint scraper to remove all the brittle sunbaked/powdered plastic from it.
the floor, wheel wells, and everywhere else that might vibrate was then treated to a layer of ghetto sound deadening. grace ice & water shield, it has the same makeup as the 'cheap' dynomat but costs a fraction of it, eg. 106sq' roll is only $58 and i didn't even use half of it. although if performance wasn't a consideration, i could have added the whole roll to really get rid of the road noise. (& yes it works, but it's not a magic/miracle fix, there is still plenty of noise left).
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then came the carpet, imagine doing a massive complex speaker box
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i started by glueing the center of the carpet down and working it up along the center hump before stretching and fitting it out towards the sides of the car, bit by bit to avoid wrinkles and creases
it's a contact adhesive so you spray it to both materials (floor & carpet) and allow them to tack up before pressing them into place. it's REALLY important that you do this a little at a time so you can stretch it out and work it into the contours or you will get really nasty wrinkles. even being careful i still got a few. the carpet i used was called flexform, it's a heavyweight auto carpet with NO backing material, so it can be fitted to every contour of the floorpan.
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the piece of carpet i used for the floor was a total of 80" wide and 3 yards long, but an extra bit of length would have been good, especially if someone wanted to try this on a later mk2/mk3 car.
also i would definately recommend carpetting it in 2 pieces, one for the front floorpan, another for the rear as tuffcarguy and i got some wrinkles trying to get over the complex curves in the middle.
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with the floor eventually done, we moved to covering the side panels and trim with a lighter weight carpet designed for speaker enclosures, same idea as the floor but much harder, a few of the panels worked great, but others we ran into a few (now permanent) wrinkles or that we couldn't get the carpet to stretch far enough to lay flat inside the curves.
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still it looks a 1000x better then before.
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the doors & dash are still in need of work.... and i would really like to find out where i can get new rubber for the door seals and some new bead to run around the door and window openings to replace the yellowish/white stuff.....
more pics in my <a href="http://www.teamswift.net/album_personal.php?user_id=77">photo album</a> or click on the thumbnails to see the fullsize pics