Did i mess up? I bought mdf 1/2 4' x 8' boards to replace underlayment damaged from water. Will mdf work or should I get ocb?

I'm getting waterproof laminate flooring to put down, snap together.

the rest of the dinning room and kitchen have still have vinyl down to use as my pad to setup as a float. Someone else suggested to glue the floor down.

so, mdf or ocb?

Thanks, Wes

Oriented strand board is the better choice for underlayment, OSB. The MDF, medium density fiber board, will work, but if you have a water spill event the MDF will swell, a lot.

I have seen an MDF subfloor and it failed immediately. I recall it being 1/4" MDF material used on top of a standard OSB subfloor. I don't know why they did this, but it started cupping during the humid summer months before the floor had been completely installed. I declined that job as it seemed to be a problem already. I hope you at least have water resistant MDF. You might be ok with 1/2" mdf.

Floating floors are easier to install than glue down and can be put into place faster.