Plexus MA 425 490 ml cartridge kit is strong adhesive commonly used in boatbuilding and gluing of plastics. This glue has a 10:1 mix ratio and a 30 to 35 minute working time. It is blue in color and features a long open time for ease of use. MA 425 is used often when a the application may take more time. Most other Plexus adhesives have a rapid cure time, and can harden before applied properly. MA 425 does not.
|Description / Potential Substrates||All Purpose Adhesive, Long Open Time|
|Mix Ratio by Volume||10:1|
|Viscosity (cP)||A: 100,000-125,00, B: 40,000-60,000|
|Working Time (min.)||30-35|
|Fixture Time (min.)||80-90|
|Tensile Strength (psi)||2000-2500|
|Tensile Elongation (percentage)||120-140|
|Shear Strength (psi)||1500-1800|
Wearing gloves and a respirator is recommended.
May 24, 2022
As the spec states, this product has a 1:10 catalyst-to-adhesive ratio, and you need an applicator tool with a suitable smaller catalyst (activator) push pad than that on the applicator for 1:1/1:2 cartridges. See my review of the Cox M400XMR series of applicators. There is a way to adapt the 1:1/1:2 model for use with all three cartridge ratios by changing just one part.
July 6, 2017
Great Bonding Glue. Must use special dispensing gun. Great gap filler. Mix in very well vented area (yes, really). Working time seems to be less than advertised. Glue expensive, gun expensive, but otherwise great.
July 10, 2013
Used the MA425 to bond a deck to hull. Tests prior to actually bonding the deck proved this stuff sticks. To get it apart, plan on destroying the part. My test was on fiberglass foam core panels, the glass had a peelply finish. The dispenser gun is solid and works very well. I had no problems at all with the stuff, not a single misplaced bead. The stuff mashes well and does not require much clamping pressure. You might need spacers to keep it from squashing too thing but it won't run on vertical surfaces, it stays where you put it.