Etti Motor Mounts

[JimClark]

What have you guy's been using to glue the Etti Motor Mounts tot he bottom of the hull?
Just using epoxy and doing a Fillet of Epoxy on each of the 4 sides of the mount or have you been adding wood to increase the gluing surface?
I made some alum brackets for my 1/10th scale so I could bolt it on but that is not going to work on this boat so got to do something else.

Jim

[siberianhusky]

Just installed another one in a H&M cat, been using JB weld.

[DPeterson]

Iv'e used various methods over the years including epoxies and JB. A friend told me to try Marine Goop. Best advice I have ever received. Iv'e stuffed my 11-12 pound boats and nothing breaks loose. The other nice thing is the goop set fairly quickly - you can build a boat in a day.

[LarrysDrifter]

Ive been using Z Poxy finishing resin mixed with milled fiberglass. Mix to a putty like consistency and neatly apply. Havent had anything break loose yet. Had many bad wipe outs and still holding strong.

[jkr]

Iv'e used various methods over the years including epoxies and JB. A friend told me to try Marine Goop. Best advice I have ever received. Iv'e stuffed my 11-12 pound boats and nothing breaks loose. The other nice thing is the goop set fairly quickly - you can build a boat in a day.

From the technical data seems to be stronger from a 5 min epoxy.
Is it bonds strong to epoxy?

[dana]

I've been using 30 min epoxy, But first I take strands of carbon fiber and cut it up so it resembles milled glass, and mix that in.

[LarrysDrifter]

Faster setting epoxy is weaker than longer setting.

[dana]

I realize this. But when used in bonding materials, it is quite strong. I never lay carbon or fiberglass with it, but all my motor mounts are done this way, and theyre very strong.

[dana]

I think what's more important is the prep work where you glue.

[LarrysDrifter]

Yep. Always sand both surfaces then clean them before epoxy. I also tack the mount with CA to hold it in place while I apply epoxy.

[properchopper]

Some good advice here :

Larry's 100% correct : Prep, Prep - ROUGH sand all mating surfaces, Tack in place with CA after trial alignment to keep shaft/collet mating perfectly, then add the bonding agent of your choice

I've done this to make a secure bond using JB :

DSC01065-1.JPGDSC01069-1.JPG

Since then, I have gone to this :

http://www.westsystem.com/ss/g-flex-epoxy/

G/Flex is THE STUFF if you want things to never unstick. 2-3 hours to set and 24 hrs. to fully cure - Again, Larry is correct, faster setting is weaker than longer setting. I use G/Flex exclusively on all my "bulletproof builds"

[dana]

Reading the instructions and using glue for their intended purposes is the best idea. You can have success with even 5 minute epoxy if you prep well. I'm not suggesting it, but hey, we aren't gluing a dump truck to the underside of a bridge here... Lol

[properchopper]

When I built the first IB34 mono, I glued the rails/battery box in with 30 min. QuickBond epoxy. On a stupid/windy/choppy day I was goofing off and backflipped the boat. The "bonk" could be heard for miles (NO damage to the hull,'tho) The entire rail/motor/battery mount came unstuck . From that moment on it was G/Flex !!

[dana]

I can understand that...sorry to hear of your misfortune dood

[properchopper]

I can understand that...sorry to hear of your misfortune dood

Thanks, but a "blessing in disguise". Thirty minute QuickBond epoxy is $11.99 ; G/Flex is $19.99. The extra $8 is well worth the money to insure no more stuff coming loose. Does make a build take longer while waiting for full cure, but I'm a total convert - 'specially since I build boats for customers and it helps me sleep at night knowing builds will (hopefully) stay built