Went to hardware and was told to use water based silicone for MDF but was not happy with adhesive quality,,,,What is the best silicone to use for MDF??
will standard silicone adversely effect it??

DO A SEARCH PLEASE!!

This question was JUST asked!

http://www.caraudioaustralia.com/forums/in...showtopic=57678

go buy caulk, sellys make it. its white drys white and seals the box up nice and well Think i got the multi purpose one!

and fury was right on the money, the other topic is only 2 links down from this one :\

Selleys Aquadhere or a generic PVA adhesive is best. If you have straight clean cuts, drill tap holes and use enough screws, then you will get a far superior bond than any silicon can ever give.
Use liquid nails or silastic to seal air leaks around joins (which, if you did it properly, you shouldnt need but its always best to be sure).

for the joins i use aquadhere and screws...

then i usually run a bad of 'sikaflex' on the inside of the joins as an extra precaution

its more expensive than normal silicone (around the $17 mark for a tube) but i reckon its worth the money...

sticks like crap to a blanket too - just make sure that you run over the Mdf with a lightly moistened cloth first to get ridd of saw dust etc etc

Sorry there fury u are right but have spent ALL of my spare time in here reading
must have read every suggestion in here BUT the one mentioned although my question was more aimed at the( will standard silicone adversely effect it??)
area. I have heaps of it and no longer trust the ppl at the hardware as they really dont have a clue. Neither do I so here I am using, and appreciating the learned skill of you all.It is all i have, till I get time to get out there n learn for myself and YES i did read the intro about searching relevant topics but felt i needed more info . sorry will remember to word questions more carefully next time.

Like all good tradsemen I blame my tools 4 the 1mm gap at rear of box at 45angle. Thanx guys went for sikaflex then screwed( after setting) will fibreglass later just 2 b safe,,, will post a pic later,,, had to set up a winch in garage to get it in boot ,,,lol

I used some liquid nails the other day.... what crap. I think before I was using the expenisve sikaflex stuff (i'm not sure). But the brown liquid nails stuff is crappy. It just isnt as sticky, drys too fast, looks like crap and doesnt feel as chunky as the other stuff.

Well, i've used sealey's silicon, $5 silicon from bunnings, $2 silicon from bunnings...
All have worked fine, done the same job, no problems whatsoever...

normally use pva then screw on the join then use white caulk on the inside...if building something on the beefer side then i use a good quality liquid nails and caulk instead of the pva

ps clear and black work pretty well also

can you keep me out of this
i stopped doing that when i started wearing my spiderman undies

Yea liquid nails may be fine for real timber but it's not suitable for MDF at all, some of my older (2-3years) enclosures done with liquid nails will collapse on themselves if you took all the screws out, the ones with PVA glue would require a sledge hammer.

Regarding silicone when I use some I only use the acetic cure 100% waterproof variety (same stuff used for fish tanks) since it's the strongest.