Construction Adhesive is a bad sealant

[edgeau]

Just a word of warning if you get tempted to run a bead of construction adhesive as sealant because you already have it in the caulking gun etc. It worked for about a year for me before cracking. It is just not flexible enough. Fortunately I only experimented on a small section and have now redone it with the good stuff (Sika flex pro)

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[Tomterrific]

I would say construction adhesive is a bad caulk. What CA were you using? PL 3x and 8x are urethane based as is Sika Flex. Put PL between joints and it is nicely gap filling so seals joints just fine. I used and liked PL for its strength and gap filling since I am NOT a fine woodworker. I tooled the squeeze out with a finger and used poly urethane caulk over the edge.

Tt

[tony.latham]

...a bead of construction adhesive as sealant...

Liquid Nails?

T

[swoody126]

ADHESIVE ≠ SEALANT

unless it is a fillet of thickened epoxy...

sw

[edgeau]

I would say construction adhesive is a bad caulk. What CA were you using? PL 3x and 8x are urethane based as is Sika Flex. Put PL between joints and it is nicely gap filling so seals joints just fine. I used and liked PL for its strength and gap filling since I am NOT a fine woodworker. I tooled the squeeze out with a finger and used poly urethane caulk over the edge.

Tt

Yes bad caulk is more accurate. I was using liquid nails. And where it is glueing two pieces together it is just fine. It was where I used it in a way that it was not designed for that it failed....

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[edgeau]

...a bead of construction adhesive as sealant...

Liquid Nails?

T

Yup

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[tony.latham]

...a bead of construction adhesive as sealant...

Liquid Nails?

T

Yup

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I'm an advocate of PL Premium. I've always got a tube stuck in a gun laying in the shop. Haven't bought a tube of Liquid Nails in years.

Here's a good reason to avoid the LN stuff:





Tony

[Dan242]

I used the PL glue on my woody, seems to be holding just fine. I can see where LN might need a back up though

[edgeau]

...a bead of construction adhesive as sealant...

Liquid Nails?

T

Yup

Sent from my Pixel using Tapatalk

I'm an advocate of PL Premium. I've always got a tube stuck in a gun laying in the shop. Haven't bought a tube of Liquid Nails in years.

Here's a good reason to avoid the LN stuff:





Tony

Interesting video

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[aggie79]

ADHESIVE ≠ SEALANT

unless it is a fillet of thickened epoxy...

sw

Au contraire. I used copious amounts of this (expensive) adhesive/sealant to adhere and seal aluminum sheeting, trim, hardware, etc. in my build:



https://multimedia.3m.com/mws/media/1198187P/3m-marine-adhesive-sealant-4200fc-white.jpg