laminate corners not gluing properly

Furnished content.
(from WoodNet.net)

Sometimes the corners of a laminated top don't adhere very well for me.I've had this issue at times in the past on small and larger projectsand on this kitchen project i'm in the middle of (which is by far the largest laminate project I've done to date). I don't know what I could be doing wrong. There's adequatecontact cement and I'm press-rolling it with plenty of pressure, but sometimes a corner or edge just doesn't stick well. Not on all corners, but maybe a third of the ones I had to do. It was no biggy to correctwith 2-part epoxy and clamps, but frustrating fussiness nonetheless.

This time I also had two ends about 24 inches across that I noticed were wanting to open up slightly. Fortunately I noticed those soon afterthe lamination process and I clamped them down with a caul. Left them overnight and there's no more issue.
The entire countertop adhered well, but just nota few corners and those two edges.

The contact cement isn't that old. A few months since I first opened itand it waskept inside the house between use. I mixed it well. The 5x12 laminate roll was taken out of the shipping box a good week ahead of installation and left rolled out to relax for several days. Eventually I did roll them back up into large rolls to stand up out of the way. The diameter was like a good 36-40". So it's not like I popped the tightly rolledlaminate out of the shipping box and slapped it onto the substrate.

It's going to be a long minute before I have another plastic laminate project, but what could I maybe do differently to avoid this adhesion issueandhaving to fuss with it?
thanks!

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Countertop Miter Done

Furnished content.
(from WoodNet.net)

I posted this as a reply to my other thread, but it's at the bottom of a long threadso I thought I'd just make a new post about it here.
I chose to go with a 90 instead of a long 45-ish miter on my countertop.

Here is a picture of the countertopwith the finished butt joint. I failed at getting the seam less noticeable than I had hoped, but it's more than acceptable to loml so I'll take the win.
I'm happy with it and that I chose to do the 90 instead of a 45 as this is visible from the dining room on the other side of the peninsula.

Here is a picture before I finished routing the corner. I purposefully did not chamfer the edge all the way to the corner, so that I could do that after final installation. I could have done that at the time of dry assembly in theworkshop, but then I would have had to fuss more about getting the router corner to match up.

The hardwood edge is hickory, which is not yet finished. That also was deliberate. I figured it might get scuffed during installation, so I'm opting to apply the finish after install. So next on the list of things to do is to scrape and sand the wood edge and get the finish on it asap.

thank you too all for your thoughts and insight on this project to date.

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The Woodshop Shed 5 05 2026

laminate corners not gluing properly

Countertop Miter Done