Best Resin Joint Kits for Waterproofing & Potting: 2025 Expert Review
Oli at OR Electrics
Fully Qualified 18th Edition Electrician
If you live in Leeds or anywhere in the UK, you know that keeping moisture out of outdoor electrics is a constant battle. I get called out to 'nuisance tripping' faults weekly, and nine times out of ten, it's a spider or a slug that's crawled into a junction box, or condensation that's bridged the connections.
The professional solution? Resin potting. Whilst proper armoured cable joints (like resin straight joints) are essential for burying mains cables, two-part epoxy resin kits are incredibly useful for 'potting' (filling) junction boxes and sealing LED driver enclosures to make them completely watertight.
In this review, I'm looking at three resin kits available to the public. Whilst often marketed for crafts, the chemistry is what matters—a solid, non-conductive, waterproof seal. Here are my top picks for sealing your outdoor lighting connections.
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Specs vs. The Real World
The Spec: "IP68 Rating"
"A junction box rated IP68 is supposed to be fully submersible and waterproof without needing resin."
In the damp Yorkshire climate, rubber seals perish, and thermal expansion sucks moist air in. Within a year, 'waterproof' boxes often have water inside. Resin filling eliminates the air gap, making it physically impossible for water to enter.
The Spec: "Hardness / Curing"
"Epoxy creates a 'rock hard' finish for protection."
This is great for permanent waterproofing, but remember: once it's potted, it's permanent. You cannot change a wire or replace a fuse without cutting the whole box out. Only pot connections you are 100% happy with.
My Top 3 Recommendations
Three options to cover different needs and budgets
Epoxy Resin Kit 16oz/474ml - Crystal Clear Resin and Hardener Resin Epoxy kit
UMIKEL
This kit offers excellent value for smaller potting jobs. If you just have two or three junction boxes to seal on a deck lighting circuit, the 474ml volume is plenty without leaving you with loads of waste.
The Good
- Very affordable for small DIY electrical sealing
- Clear mix allows visual inspection of connections before it sets
- Self-levelling nature helps it flow around terminal blocks
The Bad
- Curing time slows significantly in cold Leeds garages
- Hard sets permanently (difficult to remove if you make a wiring mistake)
Installer Tip:
Before pouring, ensure your cable glands are tight. This resin is runny enough to seep out of loose glands before it cures, potentially making a mess of your patio.
Priced at £8.99 at the time of writing
Check Price on AmazonResiners Epoxy Resin Starter Kit, 1L Crystal Clear Resin Kits for Beginners
Resiners
For larger garden lighting installations involving multiple spike lights or distribution boxes, this 1L kit is the professional choice. The larger volume means you can mix enough batches to do a whole run of lights in one session.
The Good
- Excellent flow viscosity gets right into wago connectors
- 1 Litre quantity is ideal for multiple junction boxes
- High gloss finish repels water effectively
The Bad
- Includes craft moulds which are unnecessary for electrical work
- Higher upfront cost if you only have one connection to seal
Installer Tip:
This resin mimics the properties of professional electrical potting compounds well. When mixing, scrape the sides of the cup thoroughly. Unmixed resin won't cure and will leave a sticky, conductive mess inside your junction box.
Priced at £19.99 at the time of writing
Check Price on AmazonRoizefar Epoxy Resin Kit, 480ml Crystal Clear Resin Kits for Beginners
Roizefar
Sometimes you're up a ladder or at the bottom of the garden and you realise you don't have mixing gear. This kit is a problem solver because it comes with everything: gloves, cups, and sticks. It's a 'grab and go' solution for sealing repairs.
The Good
- Full kit includes gloves and measuring cups (saves hunting for tools)
- Good 40-minute working time allows for precise pouring
- Hard, scratch-resistant finish once cured
The Bad
- Contains glitter and pigments (do not use these in your electrics!)
- Slightly more expensive per ml than the budget option
Installer Tip:
Discard the glitter and focus on the clear resin! Use the included droppers to inject resin into particularly small connector housings where a standard pour creates air pockets.
Priced at £14.99 at the time of writing
Check Price on AmazonFrequently Asked Questions
Can I use these resin kits for burying mains cables?
Why should I pot my garden light connections?
How long does resin take to cure in cold weather?
Is resin potting permanent?
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