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Adhesive needed for pvc to mdf smooth side

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Forum topic by scribble posted 04-26-2017 02:23 PM 634 views 0 times favorited 10 replies Add to Favorites Watch
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scribble

196 posts in 2319 days


04-26-2017 02:23 PM

Topic tags/keywords: question

I am looking for an adhesive that will allow me to secure my 4” S&D pvc pipes to the smooth side of MDF. I tried the construction adhesive I had on hand as well as some 5 min epoxy and the epoxy held well until I exerted a little force on it trying to get my flex hose inside it.

I appreciate any suggestions.

added Pictures

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”


10 replies so far

View nkawtg's profile

nkawtg

280 posts in 1369 days


#1 posted 04-26-2017 02:43 PM

Urethane glue may work, but the epoxy should have.
Perhaps roughening the area on the MDF to be glued would help with adhesion.

View Kazooman's profile

Kazooman

1115 posts in 2070 days


#2 posted 04-26-2017 02:51 PM

If I understand correctly, you are trying to secure the end of the PVC to the face of the MDF. I don’t think that will ever be very strong. I would make the hole in the MDF the size of the OD of the pipe and glue the pipe inside the hole, perhaps with a small screw or two to secure it. The wood analogy would be a very weak butt joint as compared to a mortise and tenon.

View Bill1974's profile

Bill1974

126 posts in 3103 days


#3 posted 04-26-2017 03:03 PM

I would try to mechanical mount the pipe and used the adhesive to function as a sealant.

You might have to pre-treat the MDF to seal it and add some strength to the fibers and them bond the pipe to it.

Maybe a couple of pictures of what your looking to do you also help us help you.

View rwe2156's profile

rwe2156

3069 posts in 1599 days


#4 posted 04-26-2017 03:25 PM

What Kazooman said !!!!

-- Everything is a prototype thats why its one of a kind!!

View scribble's profile

scribble

196 posts in 2319 days


#5 posted 04-26-2017 03:49 PM

I see people make them like this all the time with just but jointed but none of them used MDF. I wonder if I just scrap the mdf and go to plywood if the adhesion would be better?

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

View bigblockyeti's profile

bigblockyeti

5206 posts in 1838 days


#6 posted 04-26-2017 04:18 PM

Even if you do get a good bond on a butt joint, the point of failure will be moved from the adhesive to the smooth face of the MDF peeling away. Kazooman described what would be your best bet and the method I’ve employed several times with zero failures to date. Roughing up any part of the smooth PVC that will be in contact with epoxy will give it a far greater chance of adhering securely.

-- "Lack of effort will result in failure with amazing predictability" - Me

View Loren's profile

Loren

10477 posts in 3766 days


#7 posted 04-26-2017 04:25 PM

It’s an inherently weak joint I think. I would
just do what you did and add some l-brackets
with screws around the perimeter.

Another approach would be to make the hole
so the pvc goes inside the hole.

View DrDirt's profile

DrDirt

4451 posts in 3860 days


#8 posted 04-26-2017 04:27 PM

+1 Kazooman.

You need a bit more glue surface than just the 3/32 inch edge of the PVC piping.

I would enlarge the hole so that you are inserting the pipe into the MDF, and glue it that way.

-- “The two most important days in your life are the day you are born and the day you find out why.” Mark Twain

View Woodknack's profile

Woodknack

12331 posts in 2498 days


#9 posted 04-27-2017 12:43 AM

Make a ring of MDF to double the glue surface and increase mechanical strength.

-- Rick M, http://thewoodknack.blogspot.com/

View RogR's profile

RogR

111 posts in 983 days


#10 posted 04-27-2017 04:58 AM

Not really disagreeing with any of the above, but try a polyurethane caulking. A big fat bead around the outside will increase the surface area of the bonding surfaces. In my experience that stuff is never eager to let go of anything once cured.

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