Some Gluing Ideas

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Forum topic by jasoncarpentry posted 05-25-2012 02:11 AM 1047 views 0 times favorited 6 replies Add to Favorites Watch
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142 posts in 2682 days

05-25-2012 02:11 AM

Topic tags/keywords: jig glue irwim clamps

I need to glue two 3’ pieces of half-round cherry to the front of a mantelpiece. The way the fireplace is built, regular clamps are out of the question. As I see it, I have three options:

1. Contact cement (which, quite frankly, scares me, plus I’m afraid of the squeeze-out of organics onto the cherry);

2. Regular wood glue, with two of us just pushing on it for at least 30 minutes; or

3. Same as #2, but make a simple triangular “sled” out of 2×4’s, with a vertical 2×4 directly in front of the piece to be glued. Have two people stand (or sit) on the sled, and use 2-3 Irwin clamps to apply pressure on the half-round pieces. The clamps would, of course, be reversed to act as spreaders.

Has anybody ever tried #3? Am I making any sense? I say two people because I weight only 140 lb., and I think I’d need more hold-down weight than that. But now that I think of it, I could put rubber (or some other high-friction material) on the bottom of the sled to keep it in place.

I invite your feedback!

-- Jim in Tennessee

6 replies so far

View Lee Barker's profile

Lee Barker

2170 posts in 2878 days

#1 posted 05-25-2012 01:01 PM

Hi Jim—

I think this will be easy to solve. I offer two suggestions:

First, if your joint is really true—that is, flat surface to flat surface—you can glue it with TB II. It tacks up pretty fast, and for a joint like that, you don’t really need clamps if your glue is spread evenly and in the proper amount.
If your planton pieces are fairly heavy then you’d want some support under them. Try a few in-shop experiments and see.

Second, found under the “git er dun” heading, is to use 5 minute epoxy. This is a drug store product, and not great epoxy, but perfect for your application. It fills gaps in non-mating surfaces.

Some tips: Mix it thoroughly for 1 minute. Apply thinly to both surfaces. Avoid squeezeout. Hold it in place for 5 minutes. It will stay. Do one side at a time.

So: no to #1, yes to #2 if the surfaces are good and you don’t want epoxy, and no to #3, that’s overthunk.



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View Gshepherd's profile


1727 posts in 2229 days

#2 posted 05-25-2012 01:21 PM

I had a similar issue once and to solve this I used several F style clamps on the front about 1 inch from the face of your moulding. Then tapped a pine wedge between the F clamp and moulding to hold it. I forgot to mention I also had several blocks I had as a overhang so the moulding had a stopping point to be flush with the top edge. Hope this helps…..

-- What we do in life will Echo through Eternity........

View RussellAP's profile


3104 posts in 2314 days

#3 posted 05-25-2012 01:23 PM

I’m assuming that this is like a quarter round trim and will proceed from that assumption, disregard if I’m wrong.

Take the existing mantle top and clamp a board, say a 2×4 to the top on the flat area all the way across the mantle, then you’ll be able to use some smaller clamps to hold the trim on while the glue sets. TBII or Gorilla glue, I prefer the gorilla glue myself.

-- A positive attitude will take you much further than positive thinking ever will.

View jmos's profile


839 posts in 2397 days

#4 posted 05-25-2012 01:30 PM

I think Lee was right about a simple rub joint. Unless the molding is really thick (you mentioned length, but not thickness), apply a thin layer of glue and stick it up. Could try adding some blue painters tape for some additional support. You don’t need hundreds of pounds of pressure, this is not a load bearing joint, just a molding.

I’ll also throw out the obvious; a couple of brads. You’ll have a few heads to putty, but it will hold it in place and apply plenty of pressure while the glue sets.

-- John

View Charlie's profile


1100 posts in 2314 days

#5 posted 05-25-2012 01:46 PM

pin nails or even some fine staples. Staples with the grain are really hard to find. Same with pin nails. As others have said, you just need to hold it there while the glue sets up and that should happen pretty fast. Blue painter’s tape could actually work quite well.

View dhazelton's profile


2771 posts in 2324 days

#6 posted 05-25-2012 02:16 PM

I agree with the last two – shoot some 23 gauge pins into it. You’ll never see ‘em.

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