[hammer1]

I am in the process of cutting a whole bunch of MDF moldings to match some old stuff on a job. Ultimately, this molding will assemble in a panel set up in a library.
MDF is great for machining, but leaves a dimple when nailing, especially with a nail gun
I want to use some sort of adhesive. I dont like stuff like liquid nails, because its too thick, and is like using silly putty, its to thick.
I would not be adverse to buying a hot melt system, but have not seen one made for portability( big, production stuff)
Nor have I seen hot melt glues for carpentry with a suitable "open" time
Any ideas?

[45Kevin]

Use normal white or yellow carpenter's glue with clamps. MDF glues up very strong.

Liquid Nails and PL-xx are for framing lumber and panel goods.

[-Spike-]

^What he said.

[beaufort-fj60]

A contractor friend uses mdf exclusively for interior trim, he uses any wood filler for nail holes.

[45Kevin]

When you put a brad into a piece of mdf, the mdf sort of craters up around the hole. Each nail hole should be sanded before it is filled to get rid of the "sides" of the crater. If the moulding is getting a matte finish, this is not so important, but if the finish is glossy then the it is really important.

Use glue and clamps if possible. If you must use brads, put them in the low spots of the profile.