v nails for polystyrene?

geperry

CGF, Certified Grumble Framer
Joined
Jul 24, 2004
Posts
140
From
Round Pond, ME
Business
self
I need to make 70 large frames using an extruded polystyrene moulding. What type of v nails should I use? Thanks for all inputs.
 

wpfay

Comfort Badger
Forum Support Team
Forum Donor
Joined
Sep 1, 2000
Posts
14,826
From
Jacksonville Beach, FL USA
Business
Sunshine Frames
"Soft wood" variety. They are sharper and have a shallower bevel.

EDIT: The v-nails in polystyrene are really only acting as internal clamps until the solvent/glue dries. I have never seen a properly glued polystyrene frame break at the joint regardless of the kind of mechanical fastener.
 

Jim Miller

SPFG, Supreme Picture Framing God
Forum Donor
Joined
May 19, 2000
Posts
19,066
From
Suburban Central Ohio
I agree with Wally. And here's one more bit of information:

Poly mouldings are dense, something like MDF (no reference to hardness here). When the v-nails go into the material, it does not compress as wood does. So, each v-nail acts like a wedge, and too many v-nails could cause a separation at the outside of the corner. One way around this is to glue & vice the corner, then let it dry before v-nailing. If that's not practical, then be cautious about placement, and using too many v-nails.
 

osgood

SGF, Supreme Grumble Framer
Resource Provider
Joined
Jun 6, 1999
Posts
3,713
From
No fixed address, Australia.
Business
Full time grey nomad traveling Oz!
Wally,
What type of glue do you use?

I've been using cyanoacrylate and holding the joint together by hand for 15 seconds, then inserting vee nails after the frame is together.

You're right that the joint never breaks. I have tried to break a few and they always break somewhere near, but never on the joint.
 
Top