[Rock Ball]

I will be painting my Triple 12" OB H-Frame subs with Duratex.  Should I bother painting the areas that will be covered by No Rez?  The only reason I can think of to do that is if the No Rez sticks to Duratex better than the bare MDF.  Does it?

[FullRangeMan]

Yes paint inside mate black to less formaldehyde vapors.

[DeeJayBump]

No Rez will stuck better to bare MDF surface. If the surface is Dura-Tex painted, use contact cement to get the No Rez to adhere to it better.

[DeeJayBump]

dupe

[Peter J]

Disregard the formaldehyde comment, it's not pertinent with the MDF that Jay and Don are using.

For absolute best adhesion, one could seal the bare MDF surface with a light coat of shellac or sanding sealer, but it will adhere just fine to clean, bare MDF.  I wouldn't recommend Duratex as sealer as it's too viscous and it's really not intended for the job.

The aim is to get the NoRez in intimate contact with the substrate to best take advantage of it's damping qualities.

[Captainhemo]

Yueah, no formaldahyde anymore.
 We've ahd issues with no-rez/duratex... seems to stick well at first but after  a bit of time,  it seems to release.  This could vary depending on how you   finish the Duratex.
I'd seal up the inside witha   nice coat of  black paint, you  want the baffle to be black as even when the no-rez is installed,  yoiu  can  see it  in places.We've done this an have  had no issue with  no-rez or paint   releasing.

jay

[WC]

Would it make sense to paint the interior of a sealed subwoofer to install the no-rez or just adhere the no-rez to the bare MDF?

[Captainhemo]

Would it make sense to paint the interior of a sealed subwoofer to install the no-rez or just adhere the no-rez to the bare MDF?

You  probably  don't need to but   for the price of a rattle can of  shellac,  wouldn't be a bad idea
If you do  stick it tothe bare MDF,   wipe it down  real clean, the no rez   really  likes a  smooth surface....  put lots of pressure on it if you can too
jay

[morganc]

Does anyone have :
1.  Recommendations for the black paint to use inside the Cabinet before applying the No Rez? 
2.  Do you just cover all the surfaces inside with No Rez or is there a special method? 
3.  What is the best for cutting the No Rez? 

Thanks in advance. 

[Hobbsmeerkat]

Does anyone have :
1.  Recommendations for the black paint to use inside the Cabinet before applying the No Rez? 
2.  Do you just cover all the surfaces inside with No Rez or is there a special method? 
3.  What is the best for cutting the No Rez? 

Thanks in advance.

1: You don't need to paint the inside of the cabinet, just the outside parts your going to see. So long as the MDF is clean it'll stick just fine. 

2. It should be applied to as much of the bare, flat surfaces as it reasonably achievable, with the bottom left bare for mounting the crossover board. The back/ sides and top are the primary focuses, with cut outs to fit the structural braces, binding posts & the port.

3. For clean cuts, a table saw or band saw should work great. If you're not picky, a sharp box razor or hack saw blade will work as well, but will also be more tedious.

[FullRangeMan]

Does anyone have :
1.  Recommendations for the black paint to use inside the Cabinet before applying the No Rez? 

Use thick mate black oil paint in all sides, car áudio guys use it to decrease the hi freq since the 1990s. Please note No Rez will increase the bass freq a little or none IMO, but could be Interesting have Danny word on this.

[Hobbsmeerkat]

Use thick mate black oil paint in all sides, car áudio guys use it to decrease the bass freq since the 19 90s. Please note No Rez will no increase the bass freq though.

You could also use a butyl based dampener like Dynamat or Lizard Skin. Then glue in a layer of 1" soft foam or insulation, then add in loose polyfill or fiberglass/rockwool insulation over the crossover.

[FullRangeMan]

They are black colour  ?