Bolts as stubborn as me - I'm going to cry!

[VW BUSH]

No threadlock or copper slip!

Torque em up to about 50Nm and you'll be good to go.

50nm will do if you like, a 10mm thread should be 77nm (i could post the torque values for most bolts plated and non, my book is around here somwhere)
I use copper slip (Sparingly) on them as they tend to Corrode together.
If the bolt is correctly torqued then no loctite is needed, Copper slip will not cause the bolts to become loose only poor tightening or re using bolts which have been stressed past their elastic limit
I only use loctite on high vibration articles and soft materials where deformation can cause loss of torque, Thread seal/lock is a different fish altogether.
You should chuck any bolts you have had to bludgeon heat or impact off as they are prone to fail especialy as they could work harden during service life.

Quick Guide
M6 Non plated 16nm    PL 12nm
M8 "            "  39nm   PL  29nm
M10               77nm   PL  58nm
M12               135nm  PL 101nm
M16               330nm  PL 248nm
This is for 40/43 RC alloy steel bolts ISO898/1 G12.9.

 

[Josho]

To get them out, I used a socket set with a hex bit adaptor, with an extension. So I didn't chew the bolt head, I hammered the hex adaptor into the bolt, then rested the extension on an axle stand and used that to keep the hex adaptor straight so it didn't half come out and chew.

Then I tapped it with a mallet loose.