Whatever you use to repair your board don't use the Polyester Resin commonly found in car rust repair kits. I mixed up a nice batch of this stuff with q-cell and almost melted the nose off my board
I've seen better nose repairs on Wacko Jacko. If your trying to make a hollow board petrols much easier.
Thus my previous reply: frustration that when somebody posts here saying "I've heard lots of differing opinions, what is the correct way to repair it?" and still we get the bvullsh!t responses about how any epoxy will do, silastic sealant is fine if it has Marine written on it, my mate reckons, the Bunnings guy who used to have a mate who used to surf a bit told me.... and so on.... [}:)]
Maybe Laurie can post a Sticky in the forums.... half a page about how to repair an epoxy foam sandwich sailboard.... and all the question threads get deleted before the 'experts' get to do their damage.
Oh cr^p I said I would leave this thread alone.....
A picture is worth a thousand words... next time someone asks if bog is OK then just show them that picture. Thanks for that Mr. Board!
I am surprised that no-one has mentioned the BoardLady yet. There is a huge amount of information here regarding board repairs (including warnings about using polyester resin on foam cores :-) )
boardlady.com/
I think the answer to the first question about Araldite is - if you need a quick and dirty repair to get you back onto the water, go for it. But you will need to repair it properly before long.
JB
OMG, this thread has really gotten out of hand. (I know I was wasting my time asking for only informed replies) LOL!! 
The fact is, this is a VERY minor hairline crack about 1cm long across the nose, that is obviously due to an impact from the mast.
Although I cannot be 100% sure, I am willing to bank on the fact that there is no damage beyond what can be seen on the outermost layer. (I have the left the board in the sun, with the bung sealed, and there is not the slightest hint of moisture being forced out the crack.)
It is so minor that I guess 9 out of 10 guys would not even bother giving a thought to repairing it. But being the analy retentive character that I am....
So, suffice to say, all I wanted to know was if the tube of araldite I have sitting in my cupboard would do, or whether I should go to the shop and buy some West Systems resin.
Anyway, I think I have the answer, (consensus is that araldite is crap), but judging by the forecast, its gonna have to wait until another day... 
Thanks to most for the entertainment, (and to a select few for some informed advice). 
Regards,
Harrow.
Are you guys sure urethane is OK????
I'd only be game to try it on a test sample.
I'm fairly sure urethane spray paint melts it, but that could just be the thinner in it..
2 pack polyurethane foam not only fills voids in damaged styrene core boards,
it also leaches surrounding moisture out of a damaged, wet(not too wet) core,
as it uses moisture to help the transformation process from liquid to hard foam.
