cleaning up/Repairing old tubes?!

[Mr-d]

Right, This refers to the zodiac thread, but i want it to be noticed.

I am having some problems, as can be seen in the attached pic there was this patch that was leaking, it was covered in red junk, no idea what it is, and all sorts of glue (and it looks like someone has added a wad of rubber to it somewhere along the line) I tried using thinners to clean it, this just results in the glue/gunk becoming flexible... So i left it to dry again and tried sanding it, this seems to work but takes FOREVER!

And then there are the two holes i have found when i removed the transom + floor. I have patched them twice now, and they still keep on leaking...
I lightly sanded the area, used meths to clean it up, left it to dry, applied bostik on the tube, and bostik on the (New) patch. Waited for it to go semi dry, smacked it on, applied pressure, left it for another five minutes, and inflated the tube... It keeps most of the air in, but a tiny tiny bit is leaking along side the patches. So i took them off again and smacked some more glue on and stuck them back on again, again a most minute amount of air is leaking out... what am i doing wrong?!

Now the other tube, (the rainbow gunk one) the patch has gone all dirty, and i have started to peel the gunk off the patch again, as its the only large patch i have left (except for the original one that came off, which can be thrown away..) So i am pretty sure all the bumps and lumps of glue/rubber/junk are keeping it from sealing off propperly... What can i use to remove the gunk? just sand it lightly?

So Summing up the points:
1. How to make it airtight with Bostik.
2. Cleaning up the gunk.

Many thanks.
Daniel.

EDIT: Forgot to add the pic

[paul tilley]

try sanding off all the old glue . when you stick on new patches glue up twice and give the glue a chance to cure 72hrs or minimum 8hrs

[Hightower]

Daniel, if its hypalon you can used an angle grinder with a sanding disc to remove all the gunk. As for the glue, the professionals use a two part type, this I belive is really good.

Andy

[prairie tuber]

here is a link to a very detailed description for gluing hypalon;

http://www.shipstore.com/ss/html/INFO/INFOHYPNEO.html

[Ezgoing]

try bostik 501 thinner to remove the glue

Use ribshne on the tubes.

I have been told traffic film remoover is good on th etubes but have yet to try it.