Epoxy resin, a waterproof thing

Hello together :)

many of you certainly already know Epoxy as 2K adhesive, material from the printed circuit board or UV sensitive even for 3D printing. When I was in the DIY store the other day, there was a massive price difference between normal LED strips and strips with protection class IP68. That's why I want to show you today how to get your LEDs waterproof. 

Epoxy resin is available in many variations: clear, cloudy, coloured, with different thermal conductivity, chemically resistant and much more. We have advocated the clear variant of Here Decided.

Safety warning: Observe warnings and use gloves!

In principle, it is possible to insert the plugs and connected cables right away, but not a good idea. Waterproof plugs are also available in many different versions, which are suitable for you you have to decide for yourself, here is an example

When using epoxy resin, there are a few things to keep in mind: First, the exact mixing ratio is crucial. The amount of resin and hardener must be exactly right and well mixed with each other. Secondly, the resin heats up during solidification (exothermic reaction), depending on the resin used, this can damage electronics. You also have to take into account, for example, that controllers produce heat, with an Arduino this is unproblematic, but a Raspberry already generates much more heat that needs to be dissipated.

Many sensors can also be poured in, but there is a limitation for the versions with LM393 switching contact that these can no longer be changed once they are set. 

Practical tip for Maker: Program a NanoV3 or Pro-Mini with the desired function, pack it into a small case and run the necessary connection cables (USB of course not!) outwards before pouring it into black resin. No one will realize what is inside, it might as well be a complex circuit.


As an application example, we bought an aluminium profile: 

And a case for our U64 panels printed which you Here can download

Here are some pictures of the components that have just been poured in:

Unfortunately, the image quality leaves something to be desired due to the lack of light in the basement.





Ultraschallsensoren für Füllstand liefern die Industrie-Sensorenhersteller wie z.B. Endress und Hauser.



Hallo Rainer,
was beim Vergießen mit dem Sensor passiert, weiß ich nicht, aber dass es wasserdichte Ultraschallsensoren gibt sehr gut, denn damit messe ich den Füllstand in meinem IBC-Fass.
Der Nebeneffekt: lange Anschlussleitung und abgesetztes Modul für die Jumper.
Preislich sind jedoch ca 15€ fällig.
LG Sören

Moritz Spranger

Moritz Spranger

Vielen Dank für Ihren Kommentar, den Ultraschallsensor können Sie nicht eingießen, da Sender und Empfänger schwingen müssen.



Hallo, mit dem Epoxidharz ist schon eine tolle Sache.
Meine Frage, kann man damit auch Ultraschallsensoren SR04 vergießen, oder ist dann der Sensor unbrauchbar. Gibt es eine andere günstige Lösung damit eine Wasseroberfläche angezeigt wird, auch wenn mal Wasser an den Sensor kommt.


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