I have two questions: what are MDF boards; and has anyone on this board done a tutorial on FMQ a large quilt on a domestic machine? Thanks.

MDF stands for Medium Density Fiberboard. It is essentially the same as plywood.

The first question can be answered here:

http://www.abchomestore.com/what_is_mdf.htm

the second someone else will have to answer.:)

We were typing at the same time, gaigai. Actually it is more like particleboard than plywood the way I understand what I read on google.

MDF boards are medium-density fibre boards.

Yeah, I noticed! LOL. I want to make a bigboard ironing board using MDF. What I see at the store looks more like plywood to me, rather than the sawdust & glue particle board, but I think they are all very similar.

Would your ironing board hold that? I'm thinking the same thing but am worried about my antique wood ironing board holding a slab of the stuff.

Be aware that MDF is very heavy. A 4x8 sheet of ¾" MDF weighs nearly 100 lbs. It is also very dusty to cut.

I think I'm going with the ready make folding table my hubby suggested. He will make the big board and lay it on there rather than my precious ironing board which belonged to my grandma! He just doesn't know it yet!

Thank you, everyone.

So true. MDF has a greater chance to warp also. I've used OSB subfloor
as Sharon Schamber recommended and it works great. I'm going to make
another one to cover my ironing board.