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bad03ranger
08-02-2008, 11:22 PM
my question is that if i use 3/8" plyboard and then coat it on the outside- maybe even on the inside-with like a spray-in bedliner material will that give it the stregth not to flex like 3/4" MDF

mapolley07
08-02-2008, 11:26 PM
nope, MDF is really solid, no possible way is 3/8 ply gonna match up to 3/4 MDF. if you used 3/4 ply instead of 3/8 you might get close if you soak it in resin

JeepSound
08-02-2008, 11:28 PM
Bedliner won't do much, so I'll have to say, no.

azimuth
08-02-2008, 11:33 PM
fiberglass the inside and outside

mlstrass
08-03-2008, 01:09 AM
why not just build with 3/4" MDF?

GearGuy2001
08-03-2008, 02:34 AM
why not just build with 3/4" MDF?

x2

After you spend the money on bedliner any money you would of saved from using 3/8 instead of 3/4 MDF is out the door.

scarolinablazin
08-03-2008, 02:38 AM
my guess is he already has the stuff he`s asking about laying around. just like i`m gonna use a sheet of 3/4 plywood to build a box cause its been sitting for a year and i have no other use for it.

bad03ranger
08-03-2008, 03:11 AM
why not just build with 3/4" MDF?

b/c im trying to get as much air space as possible the box is going in a reg. cab mini truck

can i use 1/8" and glass the box

BuckyBoy
08-03-2008, 03:17 AM
Use 1/2" MDF and some internal bracing depending on how big a box you are talking about.

bjfish11
08-03-2008, 09:02 AM
Fiberglass on flat surfaces offers very little increase in strength :fyi:

F3RR3T
08-03-2008, 09:24 AM
^^^^^^^^^^ x2

also there is no strength in coating the box with resin

bad03ranger
08-03-2008, 11:20 AM
Fiberglass on flat surfaces offers very little increase in strength :fyi:

so what would e the best thing to do if i want to use 3/8" plyboard to make it stronger

what if i build a frame of the box out of like 1x2 or 2x2 lumber then cover that with glass

F3RR3T
08-03-2008, 12:23 PM
so what would e the best thing to do if i want to use 3/8" plyboard to make it stronger

what if i build a frame of the box out of like 1x2 or 2x2 lumber then cover that with glass

one dont use plywood the vibration can cause the layers to de-laminate and sound like a queefing ******

one in the price your going to pay for fiberglass materials you coulda used mdf.

bad03ranger
08-03-2008, 12:39 PM
one dont use plywood the vibration can cause the layers to de-laminate and sound like a queefing ******

one in the price your going to pay for fiberglass materials you coulda used mdf.

so could i use 1/2" MDF and then coat the outside with something?

if so what shoud i use i thought truck bedliner would make the box pretty stong but i guess not

F3RR3T
08-03-2008, 12:47 PM
so could i use 1/2" MDF and then coat the outside with something?

if so what shoud i use i thought truck bedliner would make the box pretty stong but i guess not

truck bedliner is flexible.

you have already moved up to 1/2 inch mdf just use 3/4.

ya im persisted but i dont like using something thats not right for the job

bjfish11
08-03-2008, 01:01 PM
Do you have a copy of the box design? That will make a huge difference in what I would recommend.

F3RR3T
08-03-2008, 01:23 PM
Do you have a copy of the box design? That will make a huge difference in what I would recommend.

that is good point.

waht is bothering me though is whatever airspace he is worried about losing going to 3/4 he could also lose by having to use bracing due to the 1/2 mdf

i will wait for the design though

boomzilla
08-03-2008, 01:26 PM
yea it sounds like your gonna have to sacrifice space if you're that worried about box flex..
hope you get everything goin!

bjfish11
08-03-2008, 01:27 PM
that is good point.

waht is bothering me though is whatever airspace he is worried about losing going to 3/4 he could also lose by having to use bracing due to the 1/2 mdf

i will wait for the design though

True. Overall, you wont gain a lot of space simply by going from 1/2" to 3/4" material. But, if the design of the box will allow, you may need very little, or even no bracing at all.

bad03ranger
08-04-2008, 01:08 AM
im looking at something like this for two tens

i think the mounting depth is about 5.5"
http://www.caraudio.com/gallery/4/7/7/1/9/dd1508box.jpg