# Multiple cable penetrator leaks. Design flaw. (video) **URL:** \ **Category:** Blue Robotics Software\ **Created:** [May 4, 2020, 7:12pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312 "2020-05-04T19:12:21Z")\ **Posts on this page:** 17\ **Page:** 2
**Author:** ![kklemens](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/kklemens/32/2247_2.png) [@kklemens](https://discuss.bluerobotics.com/u/kklemens)\ **Post date:** [August 10, 2020, 6:13pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/21 "2020-08-10T18:13:35Z")
If you have a leaking penetrator, please send an e-mail to [support@bluerobotics.com](mailto:support@bluerobotics.com) with your order number and we’ll send out a replacement thruster core. ---
**Author:** ![vectrino-hr](https://avatars.discourse-cdn.com/v4/letter/v/73ab20/32.png) [@vectrino-hr](https://discuss.bluerobotics.com/u/vectrino-hr)\ **Post date:** [October 9, 2020, 1:24pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/22 "2020-10-09T13:24:58Z")
As we are challenging problems with potting maybe it is good to mention that we have leak on 2 years old motor penetrators that were spare one’s (never installed and properly stored in original boxes). So 2 new motors started to leak after 2 years. Before that we had problem with 2 more. As we only bought 10 motors, 4 is big number. Hope that we just got wrong series as I always insist on taking care of equipment. (transportation as maintenance after and before dive). 😐 ---
**Author:** ![StrikeLines](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@StrikeLines](https://discuss.bluerobotics.com/u/StrikeLines)\ **Post date:** [October 9, 2020, 3:43pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/23 "2020-10-09T15:43:54Z")
Has Blue Robotics considered using some type of plastic penetrator with better adhesion properties than aluminum? PVC maybe? ---
**Author:** ![soriop](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@soriop](https://discuss.bluerobotics.com/u/soriop)\ **Post date:** [October 15, 2020, 12:25pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/24 "2020-10-15T12:25:08Z")
I have seen adhesive heat shrink tube been used on the inside, but are people also using it on the outside? ---
**Author:** ![Boko](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/boko/32/7241_2.png) [@Boko](https://discuss.bluerobotics.com/u/Boko)\ **Post date:** [October 15, 2020, 1:23pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/25 "2020-10-15T13:23:03Z")
I use Glue Sikaflex 291 on the outside of penetrators. Looks like rubber when hardened. I hope that could stop leakage when the cables are compressed at great depths, ---
**Author:** ![mateov](https://avatars.discourse-cdn.com/v4/letter/m/b5a626/32.png) [@mateov](https://discuss.bluerobotics.com/u/mateov)\ **Post date:** [October 16, 2020, 9:11am UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/26 "2020-10-16T09:11:36Z")
Can you post the pictures? Thanks ---
**Author:** ![Boko](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/boko/32/7241_2.png) [@Boko](https://discuss.bluerobotics.com/u/Boko)\ **Post date:** [October 16, 2020, 10:09am UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/27 "2020-10-16T10:09:50Z")
No design prices… Grind surfaces slightly and clean before glue (Original epoxyglue is under the Sikaflex) ![Sika](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/9/9a152405789a9e7af9dd6ab8c66e97b4be986f2b.jpeg) ---
**Author:** ![StrikeLines](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@StrikeLines](https://discuss.bluerobotics.com/u/StrikeLines)\ **Post date:** [October 16, 2020, 2:59pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/28 "2020-10-16T14:59:39Z")
You know, if you globbed some of that stuff on and then put some heat shrink over it, it wouldn’t look half bad… ---
**Author:** ![ROV](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rov/32/3634_2.png) [@ROV](https://discuss.bluerobotics.com/u/ROV)\ **Post date:** [October 16, 2020, 4:44pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/29 "2020-10-16T16:44:58Z")
… Most common reason for leaks are to much vaselin or molkycoat, and too tight connector, let the waterpreassure mould the o ribg:) i have No loss in vaccu7m after 2 hrs ---
**Author:** ![StrikeLines](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@StrikeLines](https://discuss.bluerobotics.com/u/StrikeLines)\ **Post date:** [October 16, 2020, 6:59pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/30 "2020-10-16T18:59:44Z")
Understood. But check the video. The leaks we are discussing here are coming around the epoxy plug. [![](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/2/22ccd7fda52aa1cc6f559105b3efd692e405164f.jpeg "Cable penetrators leaking") ](https://www.youtube.com/watch?v=6rJcFJCFrGE) ---
**Author:** ![ROV](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rov/32/3634_2.png) [@ROV](https://discuss.bluerobotics.com/u/ROV)\ **Post date:** [October 19, 2020, 12:59pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/31 "2020-10-19T12:59:07Z")
Ok… Looks like its not cleaned enough before moulding???.. But it if you set it uder waterpreassure, Does it leak? Waterpreassure Will tighten the mould outwards the connector? ---
**Author:** ![ROV](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rov/32/3634_2.png) [@ROV](https://discuss.bluerobotics.com/u/ROV)\ **Post date:** [October 19, 2020, 1:01pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/32 "2020-10-19T13:01:33Z")
Sikaflex is made for letting moisture out? Et least normal Sikaflex… Learned that when i was changing Windows a Long time ago. ---
**Author:** ![ROV](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rov/32/3634_2.png) [@ROV](https://discuss.bluerobotics.com/u/ROV)\ **Post date:** [October 19, 2020, 1:06pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/33 "2020-10-19T13:06:24Z")
… Have anyone trues scotchcast instead of Epoxy?.. A bit softer, so ut Will expand inside the connector but seal it Better?.. Just å thought? ---
**Author:** ![rasmus](https://avatars.discourse-cdn.com/v4/letter/r/7993a0/32.png) [@rasmus](https://discuss.bluerobotics.com/u/rasmus)\ **Post date:** [October 19, 2020, 2:51pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/34 "2020-10-19T14:51:52Z")
By propper connectors 😃 i had sucsess with grinding the inside before scotshcast and ca 2 cm og heat shrink as a mould on the water Side Down to 200m gluing directly on anodized aluminium is not the way to go ---
**Author:** ![Boko](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/boko/32/7241_2.png) [@Boko](https://discuss.bluerobotics.com/u/Boko)\ **Post date:** [October 19, 2020, 2:52pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/35 "2020-10-19T14:52:15Z")
Sikaflex has a lot of products 291 is a Marine glue and sealant ---
**Author:** ![soriop](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@soriop](https://discuss.bluerobotics.com/u/soriop)\ **Post date:** [October 20, 2020, 8:28pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/36 "2020-10-20T20:28:17Z")
Is there any risk in having air trapped behind the epoxy if you use heat shrink? (Heat shrink with glue of corse) ---
**Author:** ![rasmus](https://avatars.discourse-cdn.com/v4/letter/r/7993a0/32.png) [@rasmus](https://discuss.bluerobotics.com/u/rasmus)\ **Post date:** [October 20, 2020, 9:13pm UTC](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312/37 "2020-10-20T21:13:11Z")
I used 3m scotch cast its quite liquid before setting used epoxst/jbweld on the wires so the cast dont leak … [Previous page](https://discuss.bluerobotics.com/t/multiple-cable-penetrator-leaks-design-flaw-video/7312.md?page=1)