MDF bottom and sides, fiberglass top... how do you mate them??

[CoilBurner]

So ive built plenty of fiberglass ONLY boxes, and a few MDF only ( I mainly do stealth boxes in my cars)

But anyways by muddy is looking to get 2 10's in his backseat of his tacoma. His idea is to have MDF sides and bottom, but have a "wave" raised baffle.

You know the whole glass over the rings deal, but how do you do that cleanly? and strongly

My 2 concers are, if I make the bottom and sides, mount my rings on dowels then stretch the fabric over and eventually layers of glass, wont those layers obviously have to be over the sides of the box?? I was hoping to get clean square edges on the 3 visible sides

Im also concerned on if the 2 material mate well, if any certain prep is needed.

They are lower powerred 10's, but Id like to build my friend something quality

Thanks in advance!!

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[BassnTruck 10+ year member]

If you are using fleece just staple it to the mdf and use epoxy resin.

 

[CoilBurner]

My 2 concers are, if I make the bottom and sides out of 5/8" MDF , mount my rings on dowels then stretch the fabric over and eventually layers of glass, wont those layers obviously have to be over the sides of the box?? I was hoping to get clean square edges on the 3 visible sides

 

[CoilBurner]

bottom and sides out of 5/8" MDFstretch the fabric over and eventually layers of glass, wont those layers obviously have to be over the sides of the box?? I was hoping to get clean square edges on the 3 visible sides

 

[Qxxx4]

Cant take mdf out of the equation??

 

[hispls 5,000+ posts]

Fiberglass resin sticks incredibly well. Just grind/sand down the edges. If you're really worried, after you've done a few layers run some screws into the wood edge (like you were screwing a piece of wood onto it) and layer over that to clean it up.

Alternately you can make a lip on that side of the box flaring inward so you have more contact area.

 

[CoilBurner]

I dont really want a flare or a lip though. I want to have the sides all boxy and perfectly square, and was hoping to have the top only be fiberglass, but wherethey meet, like where the fleece would be stretched over the top.. I dont want anyhting going over the sides, want perfect straight lines if possible

 

[killa101 10+ year member]

All you have to do is stretch the fleece over the sides and fiberglass the fleece. When it dries you can sand off the material that overhangs and get a nice clean side. You just simply add the layer of fiberglass mat over the fleece then. You can always add some mat on the inside corners of the enclosure if you are worried about it sticking together. However, I have never had a problem with the fiberglass not sticking to the MDF. Fiberglass sticks very well to the MDF so it is not hard to get it to stick and keep a nice sharp edge. You can always fix the edges with body filler after you are done fiberglassing as well.