I am building a Rob Cosman bench with a 3" thick MDF top. I am getting closer to drilling Bench Dog Holes in it. I am going with 3/4" dog holes and will treat the top and hole openings with sealer of some kind to stiffen the MDF. I am going to make some kind of guide to get them straight. My question is :

What kind of bit would be good with MDF ?

My experience with MDF is it dulls tools and bits pretty quickly. Like cutting cardboard.

Any suggestions on a 3/4" bit for MDF ?

Thanks