Conceding games: The honourable way out?

I remember a phrase from the 4th edition rulebook regarding conceding a game. I believe it said something like: "Conceding a game counts as a victorious slaughter though you and your opponent are free to negotiate more balanced terms of surrender". I've played many a game of 40k and not being the best general I've lost many times more than I've won (many times more than I'd like but that's another story). This is most clearly represented in my recent losing streak to Luckless Xenos which before I beat his Nids last week was longer than the range of a deathstrike missile.

My "wooden spoon" prize for finally beating Luckless Xenos. The lettering reads 'Ukos' which is Tau for spoon.

I have always struggled to beat him and will admit I've occasionally conceded games when all hope seemed lost but recently I realised that it wasn't as fun for either of us if I did. So now if I know I'm going to lose, I simply carry on playing, making outrageous tactical decisions that are my only hope of winning even if minutely slim (I have beaten off a hive guard in assault with fire warriors, it can be done) and ultimately enjoying myself. There is a certain calm madness that descends when you know the end is nigh. I haven't conceded a game in a long time and feel much better for it. Anyway that's my stance on conceding from a loser's point of view.

On monday,  I played our club's resident space wolf player. I took my standard 1500 of: 

Shas'el Retha'la, fireknife with fireknife command team and 2 gun drones

Shas'el Li'sun'yi, fireknife with fireknife command team and 2 gun drones

2x deathrain team with flamers and 1 gun drone

2x 6 fire warriors in devilfish with disruption pod

2x railhead with burst cannons, disruption pod, multitracker and blacksun filter

Total = 1500 (It must be said, I like symmetrical lists)

Games Workshop Spray Paint

I managed to spray my new eldar this evening due to a lack of hockey practice and it struck me how useless GW spray is with metal models. You pay £8 for a can for a start. Sure, it will happily undercoat any plastic model you set it upon, but having spent half an hour outside freezing my fingers off (I love you, Scottish weather), to be rewarded with paint that just seeps into the creases I'm beginning to wonder if it's the best way to undercoat. Hand undercoating takes to long and I'm worried about using my local DIY stores stuff because of its thickness. Any ideas from people would be a great help i.e. what sort of spray do you use?
Ko'vash