Is M.E.K. Substitute as effective as real methyl ethyl ketone

[Bernard Kron]

For many years I've used methyl ethyl ketone (M.E.K.) as a solvent cement for styrene joints. It is very inexpensive and I can accurately control the strength of the bond by varying the amount and timing. A pint can will last me 2-3 years, easily. Recently I noticed it was coming time to get some more. When I went to various hardware stores I noticed they have all stopped carrying M.E.K. and now carry something called "M.E.K. Substitute". Has anyone had any experience using M.E.K. Substitute? Does it handle and work in the same manner as the real stuff?

[Ace-Garageguy]

I find it works for some things, not so hot for others.

Here's some more opinions...

https://forum.mrhmag.com/post/mek-substitute-12194662

https://forum.mrhmag.com/post/mek-substitute-12189588

You can still get real MEK (the Weld-On products like 2354, or the old standby #3 and #4...now labeled SciGrip) online and shipped with no crazy-expensive hazmat shipping if you shop around, and you may be able to buy it from a local shop that fabricates plastic signs or displays.

EDIT: A pint of the stuff runs about $30 shipped to your door now, higher that it was in the old hardware-store days, but still way cheaper than buying little bottles at the "hobby shop".

Edited November 16, 2022 by Ace-Garageguy

[64SS350]

I have been using MCW thin fast cement, which works well. I am going to try and match what he is making it from. By the smell, it may be an enamel reducer or something close. I also plan to take it to my local automotive paint supply store and ask them. 

 

 

 

[Horrorshow]

MEK is nasty stuff, very dangerous. I work in the aerospace industry and I know it has been banned in alot of places. Use thick rubber gloves when handling and don’t breathe it

[Mark]

The bigger the skull and crossbones are on the package, generally the better the stuff actually works.  That said, though, take all possible safety precautions when working with anything as nasty as MEK.  I used to use it to make "sprue filler", but have since been turned on to an epoxy putty that works even better and without the extended wait time the sprue filler needed.

The discontinuance of a lot of these things is probably less due to problems with occasional handling of the stuff, than because of harm brought on by long-term exposure effects on the people involved in the manufacture of it.

[GLMFAA1]

I have used weld-on 3 for years. It has priced itself out of my hobby budget. The last I had ($28.00/8oz. at local plastic fabricator) I mixed with Tamiya thin cement. Got the best of both worlds: quick adhesion, capillary action, and strong bonding.

Local fabricator was BYOC. (Bring Your Own Can back for refill at same cost)

greg 

  

[TooOld]

13 hours ago, Bernard Kron said:

For many years I've used methyl ethyl ketone (M.E.K.) as a solvent cement for styrene joints. It is very inexpensive and I can accurately control the strength of the bond by varying the amount and timing. A pint can will last me 2-3 years, easily. Recently I noticed it was coming time to get some more. When I went to various hardware stores I noticed they have all stopped carrying M.E.K. and now carry something called "M.E.K. Substitute". Has anyone had any experience using M.E.K. Substitute? Does it handle and work in the same manner as the real stuff?

I tried some and it doesn't melt the styrene at all , like Bill said it probably works for some things but not what we use it for . I was able to buy real MEK on line at this link but expect to pay hazardous shipping charges .

https://www.sherfab.com/methyl-ethyl-ketone-1qt

My guess is that any fiberglass or marine supply probably sells it .

Edited November 17, 2022 by TooOld

[Bernard Kron]

4 hours ago, TooOld said:

I tried some and it doesn't melt the styrene at all , like Bill said it probably works for some things but not what we use it for . I was able to buy real MEK on line at this link but expect to pay hazardous shipping charges .

https://www.sherfab.com/methyl-ethyl-ketone-1qt

My guess is that any fiberglass or marine supply probably sells it .

Thanks for the specific reply. Much appreciated. I'll check out marine supply stores around here. Also Ace Hardware has "Klean Strip Methyl Ethyl Ketone Lacquer Thinner" in pint cans. At $8 it's probably worth a try.

[Rick L]

MEK can be found at West Marine stores. My local Lowe’s has it but it’s sold in gallon cans. 
 

[Fat Brian]

I've been using decanted brake cleaner spray since they stopped making Tenax years ago.