MarkJRust

Does anyone recommend a certain kind of rubberized undercoating and where to get it? I noticed 3M, but is it only available in spray can?

MarkJRust

So do you recommend I even use bedliner at all? Or just skip it for a few heavy coats of the rubberized undercoating?

MarkJRust

One more thing, If I were to just do the rubberized undercoating (which I nearly have my mind set on now) do you think down the road I could apply dynamat over the undercoating if I feel I want it quieter?

Then possibly a few more coats of undercoat additionally over the dynamat? (This would be going slighly overboard I think )

MarkJRust

Time to revert to my original idea.... undercoating in the interior isn't gonna work...

http://www.naxja.org/forum/showthread.php?t=965086

DoWork25

I have never heard of rubberized undercoating being still pliable and never drying. I think it absorbed back into his carpet because it takes longer to fully cure than bedliner and he probably didnt let it set up long enough. If it was still pliable then rocks would go straight through it when you put it outside in the wheel wells... Like I have said I have never had a problem with the undercoating. I have used it numerous times and wont be nervous when I do my floors either. Also, you arent going for a rust prohibitor with undercoating the rust preventative is your rustolium primer. Bedliner isnt a rust inhibitor either. You are simply protecting the underlying metal with a tougher outer skin. That is why prep is everything with metal work.

MarkJRust

Thanks for the help, I guess I'll be returning to the undercoating idea. Do you have any pictures of yours? And as far as rust prohibitive, I'll be doing multiple coats of rustoleum. Do you use the 3M Rubberized Undercoating?

Red82

I'd get the 3m. I used the generic version from advanced auto and while it was alright it dried brown (not a big deal if it's covered but mine was in the wheel wells. thankfully its fully paintable so i just sprayed some black in there) and I've heard the 3M stuff just lasts better.

MarkJRust

Sweet, my local advance autos carry about 4 per location, how many do you think it'll take to do the floor with multiple coats?

I'm about to order 6 of the 16oz off Amazon with Prime shipping too.

The advance auto people said 1 can could probably do about 4 sq feet...

DoWork25

i havent done my floors yet but yes i do use the 3M rubberized stuff i believe its the bigger white can. the last thing i used it on was about 6 months ago on my mom's 2009 chevy 2500hd in the wheel wells and i used that because the spray on bedliner had started to peel and crack after a month. resanded and reprepped and sprayed a couple thick coats of the 3M undercoating and still looks great through the iowa winter 6 months later and she does put alot of miles on the truck too.

raypla

In my previous life I was a tinknocker (sheetmetal mechanic) by trade, I grew impartial to tekscrews and had easy access to much sheetmetal.

By time I figured out my junk had a leaky doorseal it had been detrimental to the floor and the rust had it's way w/it. This was 3 years ago I patched it the best way I could, a layer of 18 ga Stainless sheet on the ext. surface with the floor sandwiched between some epoxy and 20 ga galvanized for the int. surface, a whole helping of tekscrews.



While tackling my rusting rockers (see below) I discovered rust developing beyond the floor patch. So I took care of one issue at a time with the rockers being first.





With winter approaching it was time to do the floor. Over 2 months the rust had developed into a 3-4" hole. With the majority of the hole being under the seat rail. Once I removed the rest of the carpet, that I hadn't removed when I did the first patch job, I found the existing carpet had wicked water and developed superficial rust on the whole driverside of the XJ.



I posed a question on another forum as to which Im a member as to how they're dampening mat acts on the ext. surface and people responded w/positive findings I decided to give it a shot. Around the same time Second Skin, http://secondskinaudio.com/store.php?category=119 , just had released a new product with a total thickness of 60 mils, with 10 mils being sheet and the rest being self adhering butyl rubber. At about a 1/3 thicker aluminum sheet layer than Damplifier, I figured it was about as ideal as what I could for what I was looking to do.

Once receiving the Alpha Damp http://secondskinaudio.com/products/AlphaDamp.php#tab5 I went about to installing it. If I wanted the mat to stick a fairly clean surface is needed, so I figured now would be a good time to paint/treat the surface woth some rust treatment type of paint.







ss sheet underneath



So once that dried I placed the Alpha Damp at my feet. I once again sandwiched the floor w/a layer on the int. and another on the ext.. On the ext. I overlapped the Alpha about 6" unto the next piece to assure sufficient coverage. On the int. I patched the swiss cheese area and the parts of the floor that would see more traffic w/the thicker mat and Reqular damp everywhere else on the floor.





I don't have any pics of underneath but once I get some drier wheather, or a couple free hours, I have 3/4 of the supplied material of U-pol Raptor that I used to do my rockers with, I'm going to spray underneath covering the Alpha Damp and hopefully protect it from the dang road salt this POS state coats the road with. I'll post up some more pics at that point.

Worse comes to worse I'll just cover the floor w/some bent plate, 14 or 16 ga, that goes from the rocker to the unibody ~9". But I'll see how this holds out for this winter. All in all it took ~5 hrs to do above, when I coat underneath with Raptor liner I'm also going to spray at my feet inside and see how that holds up to the DD "abuse".

I'm happy with the results and am anxious to install the rest of the damp I have in the cargo area, doors, and roof and am anticipating favorable results in road noise reduction/dring comfort. Keep in mind my A$$ was exposed to the road but with just what I did allowed me to be able to hear my radio at 24on the highway down to 16.

Well tell me what you guys think.

raypla

So I went nutz w/the bedliner. Used 2 full bottles of Raptor. Did it in the evening so luckily I have one more bottle I intend on coating the driverside floor again, ext. HEAVY and maybe another coat on the int.. I was able to get the rockers, F&R bumpers, int. floors and door jambs. I'm happy w/the results, time will tell how it'll hold up on the floors. Oh well enough of me blabbin on to the pics....






Back seats





You can definately tell the Raptor has faded over the 2+ years but I didn't see it till this AM and it's only noticeble when new stuff is applied.....





The bottoms of the doorrs had some surface rust developing so I hit em w/some 150 gr wiped em down and Raptored em.......





Rust was developing on the rear bumper I figured why not, if ya do one why not the other, so just like the jambs hit em w/some abrasive wiped them down and went to town.





So what is the consensus? How long are you guys predicting till I have to mess with it again?

raypla

6 months later I've only had 2 spots fail to adhere.

1. At the driver side feet, it didn't fail immediatly there and looking at it I'm just going to cut the loose bedliner off put down another layer of the blak damp and spray pick up another U-Pol kit, $115 to my door, then spray over it all, likely it would have adhered mote permanently had I sprayed the Alpha Damp with some self etching primer.



2. another spot where the I bedlined over the silver SS