u/StraightupGarbage

Hi, I've come for some advice.
I want to glue a small length(12mm/.5inch) of woven CF tube on a pulltruded rod.
I have tried this 3 times using 2 different glues.
I used "bison fast kombi epoxy" for the first 2 tries, and the "easycomposites vuduglu VM100 Black MMA Structural Acrylic Adhesive" for the last one.
The problem is that it does not take a lot of force(sub 90 Newtons) to break this bond and to pull the "sleeve" of of the rod.

This is how I tried to do it:
pulltruded rod:

1. lightly use 80grit sandpaper on the location(with the rod in a drill, not much lenghtwise scratching).
2. wiping the area using a lint-free cloth with acetone.
3. wiping the area using a dry lint-free cloth

woven tube:

1. use a carbide drillbit to widen the original ID from 3mm to 3.2mm.
2. pull a thin slice of the lint-free cloth drenched in acetone through
3. the back part of the slice was dry, so I just continued pulling.(I only did this for the last test, before this no cleaning inside the tube took place.)(This might be partially responsible, as I saw a small amount of fibers stick out when I went to push the rod through when glueing)

glues:
following the instructions for both(mixing thoroughly, and waiting 1 hour for setting the bison epoxy and waiting 24 hours for the MMA glue)

application:

1. smearing it on with the mixing stick only on the area of the pulltruded rod.
2. pushing the sleeve over the glue
3. rotating and translating the sleeve a bit to try to get even spread(I think this might be the biggest contributor, as the MMA glue already felt a bit gummy, and the glues might not have spread properly or evenly)
4. holding it with the axis of the rod being vertical(to prevent assymetric force of gravity) while hardening/drying.
5. kept in west european weather/temperature(so around 31C or 88f).

What am I doing wrong?
I want the sheerforce to be more around 25-30kg/250N. Is this possible using the glue, or is it smarter to find a different way to get a thin ledge(I am using the face of one side of the sleeve as a ledge to hook it behind. The ledge does not have to be big, but should not fail.)
Will it be stronger if I take a 4mm pulltruded rod, and then "neck down" a small section to create the ledge? if so, how much "meat" should I leave behind the section against the sheer forces? And if it is a possible solution, what is the best way to "neck down" a pulltruded rod?

TL;DR: cheap, better coverage pack cover made from trashbag, waterproof. (50 gram=1.76oz, sub $2)

Because my pack is made of non waterproof fabric, I wanted to know what it's wetted out weight would be(about 200grams more using the shower iirc). I was expecting lots of rain, and I didn't want a wet pack.

Problems with contemporary pack covers: can still wet out because it is a coating wind can pull the packcover off the water from the back of my waterproof shell still makes the pack wet

I made my packcover with a (medium duty) trashbag, some gorilla tape for reinforcement, and some off-brand kamsnaps(pink because it was a prototype that I didn't care for, but actually worked)

the panel that goes against the back should be overlapped with the main body of the cover, to prevent ingress the most. The location of the kamsnaps was done to work around the straps, and to keep the cover as tight as possible against the backpack.

To make it look less like a trashbag, I use it inside out and hold the corners down with some tape(you can see the tape when in use, cause otherwise it might have pooled water).

steps(rocket surgery):

find a good trashbag and put it over your bag (normal side out).

mark the location of the top of the strap(I did with masking tape), this is where you cut

find out how much you should 'take in', this will be the overlap

mark the location from the centre of the backpanel to the bottom attachment of the strap (this is the vertical cut)

with the normal side still out place tape over the places where you'll cut, and any places you want to place kamsnaps that doesn't have reinforcement

make your cuts, do kamsnaps(make sure you do it in the correct orientation, reinforce if needed, turn inside out.

It worked for my specific situation, but I don't think I'll use it again as I am thinking of making a bag using less waterabsorbing fabric

This is my second time posting as automod placed it in limbo