smart51
|
| posted on 15/3/09 at 09:01 AM |
|
|
PU adhesive - how long to go off?
I PUed a cycle wing back on yesterday and18 hours later it is still soft. The surface is tacky but doesn't stick to my fingers but it ooses
underneath. The bead is a bit thick I suppose, bonding a 19mm tube to flat grp but how long should it take to go off?
|
|
|
|
|
jacko
|
| posted on 15/3/09 at 09:07 AM |
|
|
too dry fully 24hrs but touch dry
|
|
|
mr henderson
|
| posted on 15/3/09 at 10:50 AM |
|
|
In virtually every case, adhesives will go off quicker when they are warmed.
If it's a nuisance that it hasn't set, try warming it a bit.
John
|
|
|
omega 24 v6
|
| posted on 15/3/09 at 11:01 AM |
|
|
Skins over in a hour usually However depending on how thick the bead was it could take a while. I've seen holes pumped full of PU sealer ( say
25mm thick ) still wet in the middle after a week. It'll be better if you heat it yes.
If it looks wrong it probably is wrong.
|
|
|
cloudy
|
| posted on 15/3/09 at 11:35 AM |
|
|
3 Days for a decent bead of sikaflex to cure throughout....
James
www.warnercars.com
|
|
|
RK
|
| posted on 15/3/09 at 02:32 PM |
|
|
I leave it a week to be sure. But then, I put a lot of it on. Depends on the manufacturer though; Sikaflex takes a good week, while other, more
commonly available bath sealants take less time, and harden more (less flexible when cured).
|
|
|
dhutch
|
| posted on 15/3/09 at 03:58 PM |
|
|
While we're on the topic. Shelf life for PU?
- I presume your good for a month or so with an unopened tube. But once its opened? Days/Weeks/Months?
Failing that, anywhere where you can get half tubes, or little toothpaste-sized tubes of the stuff?
Just thinking for little jobs i have around, blob under the bonnet catches here, blob over a hole in the floor there. etc.
Daniel
|
|
|
David Jenkins
|
| posted on 15/3/09 at 04:02 PM |
|
|
Shelf life - you can guarantee that it will go off one day before you really need it urgently.
|
|
|
DarrenW
|
| posted on 19/3/09 at 02:14 PM |
|
|
Has anyone ever managed to get the tubes to last a decent length of time before going off? Ive tried all srts of ways but its like drinking beer -
once you crack the seal nothing can stop it 
Shame they never sell half tubes. I need a bit to rebond a front wing, will be a terrible waste to buy full tube.
|
|
|
