Can I use Zinnser BIN on new MDF as primer

I can't see why it wouldn't! I know this one is bought generally for stain and knotting but its an excellent primer with great adhesion and if its a case of already having that in then it saves you buying more. It will do the job.
For something the size of a door be careful though coz this stuff is so fast drying
I normally transfer just what I'm going to use in a short while into a separate pot and then get the lid closed up on the paint. If I'm dawdling I normally end up having to thin what I'm using before I reach the end
If using a brush make sure its synthetic and a good one! It makes all the difference.
This stuff rolls on nicely too but be quick and even
Hope this helps.
Might be an idea to check for further comments on here tonight though coz I'm a newbie look out for the names astramax, handy Andy, diy Dave and Devils advocate. They are on here most nights and are far more expert, they have been on here many many years.

 

P.s never throw zinnser paint away its expensive stuff and if stored correctly it will last.
If you are left with a decent amount of it and you are sure you will have no future use for it then put an advert in the local shop and at the right price it will be sold and gone within a few days its very popular stuff.

 

Is the satin wood an oil based or water base?

 

Oh yeah that too.
D'oh sorry astra I have absolutely no idea why I presumed it would be oil satin.
Damn

 

You will be fine to use B I N as the primer.

 

Cooooool...

 

Very nice! Good work

 

Yes, go over with a fine abrasive to remove the nibs the apply your satin sanding again between coats , may require 3 coats being first time painted though.