Waterproofing prints: epoxy or polyurethane

Build, Repair & Mod
1

I’m at the stage where I’m looking at ways to improve a petg housing print. The only place where I seem to be able to find a path of water ingress is where walls meet top surfaces. Everything else is quite impermeable.

I know some on here having been using epoxy coats, but I’m curious if anyone has used or compared to a polyurethane coating (or several). Seems like the advantages could be: ease of application, multiple thin layers and the fact that this would seem to be less likely to crack under flexural loads of an underboard box.

Alternatively I was looking at maybe targeted coating/filling these wall to top intersections.

Anyone have thoughts or tests about this?

2

Within a DIY group, we use Neviprim (1 compound polyurethane) on PETG prints. This makes it both strong and waterproof. IT does smell terrible and will need to be applied either outside or in a heavily ventilated room.

3

Awesome stuff. Pointed me towards the holland group which is a fun resource :slight_smile: Unfortunately shipping that to Canada is prohibitively expensive but I’m going to start researching other pu products.