Door Sound deadening.

I used a budget dynamat and it worked very well.

The theory behind heavy tar stick on panels is that their mass reduces the resonant frequency of the panel below human hearing (~15-20Hz) I don’t know if a spray on rubber product would have a similar affects, but would to a lesser degree. Also, if the finish was rough enough it would have a diffusing affect as well.  

I think an ideal sound deadening for doors would be that closed cell foam-backed carpet.
https://www.worldking.top/exhi...m-backed-carpet.html

I'm with Lane. I used light weight Dynamat throughout my whole car. It also sealed the seem between the body and pan to make it more water tight. I chose the light weight stuff to not add more weight to the car, yet keep the vibrations down. Worked out great !!

I have a roll up window it was a lot harder to do and I got some areas that I couldn’t get to easily,  so some areas I was thinking of using rubber spray to fill the gaps.   Without roll up windows it is clearer sealing…

I got the 1873 house sprayed with insulation today. That stuff is amazing, and I've always wondered if it would work as a sound-deadener inside doors.

One thing I neglected to mention, I didn't have to cover the entire inside of the door to have a significant effect on on the sound of the door when closing. Just about 1/3 coverage and the door sounded nice and solid rather than like a hollow plastic shape.

@Stan Galat posted:

I got the 1873 house sprayed with insulation today. That stuff is amazing, and I've always wondered if it would work as a sound-deadener inside doors.

I've wondered that, too.  Expanding foam, like you get in a can to seal air leaks around your home, is simply pockets of gas sealed in bubbles when it cures and expands.  It would seem like a perfect sound vibration absorbing medium, but it has limits to where you can use it.

Getting it into a door is one thing.  Controlling how much it expands and spreads out is another thing, but that could be managed in a closed space like a door by limiting its' spread with a barrier, like a plastic drop cloth or something.  It wouldn't be much good under the seats or carpets where Dynamat would be perfect because once the foam is crushed, it stays crushed.  

wish i had thought about this when Dr JEKYLL built my car...

@Gordon Nichols — I was thinking more of the “Space-Pak” style spray foam. A flash-coat  of that stuff is a uniform layer about an inch thick.  It’s wild to watch it expand.

Spray in bed liner seems to have pretty good sound deadening qualities. Isn't this what Greg spays on his cars?

Those are interesting ideas … isn’t bedliner, rubberized?   I think the doorhandle bar, and if you have a lock, the lock bars, sometimes rattle metal against the door frame. It’s kind of one of my projects for the winter.

@jncspyder posted:

wish i had thought about this when Dr JEKYLL built my car...

no matter how good your builder is there must be something to add

@LI-Rick posted:

Spray in bed liner seems to have pretty good sound deadening qualities. Isn't this what Greg spays on his cars?

Yes Rick, he does use a type of bed liner usually on the bottom and top of the pan. I had Greg omit the bed liner stuff and had my pan painted black just to make it easier to clean. The bed liners stuff traps a lot of road grime on the bottom of the pan. You would need a really stiff brush to get it clean. But the average guy probably wouldn't care what the bottom would look like. It seem undercoating is what most car builders use.

@Butcher Boy posted:

Yes Rick, he does use a type of bed liner usually on the bottom and top of the pan. I had Greg omit the bed liner stuff and had my pan painted black just to make it easier to clean. The bed liners stuff traps a lot of road grime on the bottom of the pan. You would need a really stiff brush to get it clean. But the average guy probably wouldn't care what the bottom would look like. It seem undercoating is what most car builders use.

I have had spray in bed liners in my trucks. Stuff is really easy to keep clean.

I seem to remember @DannyP having it sprayed under his clamshell, hood and inside the doors of his Spyder.

@IaM-Ray posted:

no matter how good your builder is there must be something to add

Exactly Ray !!  If you are lucky enough to have a car builder built the car for you, and address some changes you would like happen in the build, that's a bonus !!

I rented a speedster on Maui before i placed my order for my speedster. What I learned by driving that rental around the Island was some things needed to be changed if this is how they are built. The first thing was the shifter was way to far forward for me. I had to lean forward to shift and that was a pain. Next was the seat was very narrow and became uncomfortable in the 10 hours i drove it. Also the pedals were too close together for my liking so they needed to be wider. I also didn't like that the dash pad wasn't finished out to the edge of the dash. The motor seemed underpowered to me and it was .......... Granted this was an older build by Vintage when Kirk was building speedsters. Greg was very helpful in making the changes to my build. He widened my seats an inch, moved my shifter back 5 inches, I supplied him with a new set of wide pedals that he installed, I ordered my speedster with a Subaru motor, pro-street trans and IRS with sway bars front and rear. i knew I wanted dynamat installed in the car, so I bought it and Greg installed it for me. Lastly I convinced him to make the dash pad so it was finished all the way to the corners. This was a big deal for me. I couldn't stand to sit in the car, looking at that dash not being finished the way I wanted. I think I was the first build that Greg did this to and he has continued to do the dashes that way in his cars. Those are just some of the things I had done in the build. I'm very grateful and pleased with the way it came together. Even with the car built, i find you are never finished. I continue to add little touches to the car to make it better suited for me.

A friend sprayed Mastic (flooring glue) under his car for sound deadening. That car was very quiet. The coating looked to be 1/2" thick...........Bruce

I've found that sticking a thumb in the door jamb as you slam it damps vibrations from the door latch.   The screaming is a little loud, though.

Well it will certainly get it blue…

@LI-Rick posted:

I have had spray in bed liners in my trucks. Stuff is really easy to keep clean.

I seem to remember @DannyP having it sprayed under his clamshell, hood and inside the doors of his Spyder.

I use it everywhere. It’s an excellent undercoat, but it does bupkis for sound attenuation.

We used this. The shop thought it was a good idea to use black in case the carpet moved as it settled.   And,  like Lane said,  you don’t need to cover every square inch of the doors for it to be effective.