I have created a box for the rear of my tC and it has MDF top and bottom panels, but the shape is too awkward to finish in wood. I am going to fiberglass the rest of the box but im not sure which of the two options here I should do:

1: Do I wrap the whole structure in fabric and apply resin and fiberglass mat to it all over?

or

2: Do I attach the fleece fabric to the outer perimter with staples and only glass the sides where it is open and leave the mdf alone???

 

I just finished making my enclosure last week, and I hated working with fG.

I pretty much wrapped the fleece around the outside of MDF. The I fiberglassed just the fleece area. You will still get a bit of fG on the sides but you can sand them down afterwards.

 

It really depends on how you have things shaped. You can go either way. For sub enclosures, I generally tend to leave some MDF in place inside the enclosure simply to give the woofer mounting screws something to "bite" into when the woofer is mounted. However, if the amount of MDF used is quite excessive and takes up a good deal of space that the woofer could certainly benefit from, then I would remove whatever was necessary.
Here's a tip for 'glassing. Fiberglass resin does not adhere well to aluminum foil. If you cover the surfaces of your frame/mold in aluminum foil prior to wrapping it in fabric, you can remove the frame/mold easily after the resin has dried. This allows you to stretch the fabric over the object completely and tailor your curves however you like, staple the fabric in place, and still be able to remove anything internal that occupies too much space. Keep in mind, though, that the fiberglass MUST be solid in order for the enclosure to be worth anything...especially if you are dealing with a sub enclosure. If it flexes, bends, and cannot support any weight, then the woofer is going to destroy it.

 

The enclosure is going to maintain the wood top and bottom, shoud i only glass the sides or should i glass over the wood as well?

 

^ There's no need to glass over the mdf top & bottom unless you want to.