.75 MDF, what size/type of screws to use?

screw screws.

unless you dont have enough clamps, or feel like pre-drilling then driving screws into your box then say get em. 1 5/8 course thread drywall screws. 4$ at the depot.

titebond II alone FTW.

 
double baffles. boxes where bigger subs are going in, then id use em. wont hurt unless you split the wood. just extra work.

i used titebond 2 on both my boxes for my assassin 8 and it came out pretty effin solid.

 
titebond is a must. or really any woodglue. caulk on the inside edges of the box helps seal too.

two full sheets is heavy...1 5/8 screws every 4-6 inches should do fine. you could go more or less but that is what i would do.

 
you could, i dont see why not. its thinner , not like elmers wood glue. i think ive read of someone on here doing that.

the glue on the bonding pieces of the wood is really whats going to matter. ill put it like this...once that glue dries..the WOOD ITSELF is going to break before that joint does. i try and break the joint on scrap wood with every new glue i try. so far with elmers wood glue and titebond II , the wood broke first.

 
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