Sealing, smoothing FG and MDF

So, I've been working on a fiberglass/MDF enclosure, that I can remove and re-insert If i ever need the spare tire or more trunk-space, for two 10" subwoofers. So far I have only come along one thing that I'm really unsure and curious about. In the area on the edges of the fiberglass (Shown more clearly in the pictures.) Im worried that it wont be correctly sealed between that and the MDF. Should I extend the fiberglass over farther to touch the MDF, should I put a bead of silicon sealant all around between the FG and MDF (Something that I thought about, that I thought may work.) , or should I just leave it alone. Im just a little worried about it being incorrectly sealed. No big deal.

Any help is greatly appreciated. Thanks alot!  

Andy

https://i11.photobucket.com/albums/a195/andyplacenta/fiberglassed.jpg

It's my first time making a subwoofer enclosure, let alone one with fiberglass. Pretty good so far huh?

https://i11.photobucket.com/albums/a195/andyplacenta/MDFtoFG.jpg

This is the area where I want to make sure to seal up. 

Oops, for those who dont feel like clicking the links above...  heh...

It's my first time making a subwoofer enclosure, let alone one with fiberglass. Pretty good so far huh?

This is the area where I want to make sure to seal up. 

Should I put just the resin/hardener/talcom powder on the joints of the inside, or is the fiberglass mat really needed? Oh, and how many times is it recommended to repeat the process of adding body filler and sanding it?

Make about a quart or so(depending on the total size of the enclosure) and mix it with talc and 1/4" chop strand.  Make it like a runny oatmeal consistency and pour it in the enclosure, slowly 'swirl' it around in the enclosure making sure to concentrate it on the edges where you want your seal,,,this will totally seal the box and add strength to the box.  I do this on every enclosure I build the step after the resin has kicked or hardened on the fleece...Perfect seal with no silicones or foreign substances,,,

You probably won't find strand at a place like that, check www.uscomposites.com and see if they have it, you won't need a whole lot.  I buy it in 50 lb bags, if you can't find it, PM me your address and I'll send you a big Ziploc bag full of it.  I'd remove the silicone if I were you...Do you have Talc also?  I buy that in 50 lb bags as well,,,You don't do this step outside of the box, only on the inside if that is what you are meaning by 'over the top' but do remove the silicone for the resin to not have any inhibitors inside,,,

You probably won't find strand at a place like that, check www.uscomposites.com and see if they have it, you won't need a whole lot.  I buy it in 50 lb bags, if you can't find it, PM me your address and I'll send you a big Ziploc bag full of it.  I'd remove the silicone if I were you...Do you have Talc also?  I buy that in 50 lb bags as well,,,You don't do this step outside of the box, only on the inside if that is what you are meaning by 'over the top' but do remove the silicone for the resin to not have any inhibitors inside,,,