Glue "raw" plywood to painted wood possible with titebond?

[masraum]

I've got some wood that was painted white (purchased pre-painted from somewhere, not sure where, like door frames that you can get at HD). I built some frames out of the wood, and want to attache the frames to 1/4" ply.

Will titebond work or does that really require wood-to-wood contact? If so, could I use something like liquid nails or construction adhesive instead?

Specifically, this titebond

[id10t]

Think you'd want an epoxy like Gorilla Glue

[masraum]

Originally Posted by id10t

Think you'd want an epoxy like Gorilla Glue

Yeah, that's what I'm thinking too. I'll have to pick up the right glue tomorrow.

[herr_oberst]

If it was me, I'd give the pre-prime a few strokes with the edge of a new hacksaw blade, using it like a scraper to give the surface some tooth for the glue to lock into. Glue it, clamp it. Titebond is pretty good stuff.

I'd also test a piece, first.

[john70t]

It's as strong as the paint bond on both sides I'd guess.
Some mechanical bonds such as screws or trim nails would help. Or chisel off a 1/16 in areas.

[A930Rocket]

Originally Posted by john70t

It's as strong as the paint bond on both sides….

^^^ This.

Can you use some 40-60 grit on a sander to rough it up?

[gregpark]

If you bought pre painted then I'm sure it's primer and tight bond lll will stick to it just fine. I'd use a pin nailer to hold it where you want it. If you don't have one a brad nailer will work but you'll be filling holes

[masraum]

Thanks folks!

[herr_oberst]

You could also mortise a 1/4" deep rabbet on the inside edge of the frame; that'll give two benefits; no raw plywood edge exposed, fresh wood to glue to.

[look 171]

Depending on what will this project be used for? I dislike gluing anything to painted surfaces. Small stuff or something that are not used to hold up any weight, then I would give it a go.

[gregpark]

Glueing up to primer works. I wouldn't glue to top coat paint but this isn't the case. One other thing I would do after you've got your trim pieces glued and tacked is weight it down to a flat surface to allow the glued up trim to set and freeze that flimsy ¼" plywood flat over night. A "plywood press" and you'll have nice flat panels

[masraum]

Originally Posted by look 171

Depending on what will this project be used for? I dislike gluing anything to painted surfaces. Small stuff or something that are not used to hold up any weight, then I would give it a go.

Attic hatch access doors that will be hidden in the backs of closets behind clothes, so not visible, no weight to speak of.

Originally Posted by gregpark

Glueing up to primer works. I wouldn't glue to top coat paint but this isn't the case. One other thing I would do after you've got your trim pieces glued and tacked is weight it down to a flat surface to allow the glued up trim to set and freeze that flimsy ¼" plywood flat over night. A "plywood press" and you'll have nice flat panels

Right, I've got weights and clamps pressing the doors.

[gregpark]

I don't know how big your panels are but I've used my work table for smaller panels with a larger sheet of plywood on top and a car battery or two on top of that. I've pressed larger panels on the shop slab and rolled the front wheel of my motorcycle right in the middle

[look 171]

Originally Posted by masraum

Attic hatch access doors that will be hidden in the backs of closets behind clothes, so not visible, no weight to speak of.


Right, I've got weights and clamps pressing the doors.

Assume it will be painted upon finished? If so, use screws to keep it from coming apart and glues panels like if you had a press. Heat will cause glue to de-laminate some. Use your pinner, glue and screw. Fill screw holes with bondo and paint to make it look pretty.

Speaking of press. You want a heavy duty press? It can glue pieces up to about 3" wide. Its custom make for one job we did long ago. 4" square 1/4" thick steel tubing with 4 clamps on each press. I have 4 of them. Shipping will kill. About 60070 lbs each. Works great

[gregpark]

^ if you were going to use screws wouldn't you screw from the back and not bondo? Just glueing is enough anyway. Is your trim wide enough to baby biscuit the miters? Got a biscuit muncher?

[look 171]

I honestly didn't fully read the whole thing. Assuming he's gluing 1/4" plywood to the face and not the back? Screws wouldn't hold from the back

[look 171]

Ok, just read again. Steve is gluing plywood to the frame so it appears like a shaker door or frame and panel door. Screw and glue through the 1/4" plywood and be done wit it. None of the screws will be seen

[gregpark]

We use screws for drawer fronts because they're being pulled on but not for delicate mitered trim.
Brutal