I am not sure what stock your working with that might be important, but.....
The working side of the lug (rear facing the front of action landing) should not change. The area in front of the recoil lug is not important, in general; the bottom of lug should not touch the epoxy or stock anyway. You must have bedded the first 1" to 1 1/4 in front of the lug? If you just rough it it all up with sand paper or whatever ("no shiney stuff"), clean with lacquer thinner to make sure it is clean, use the same epoxy, make sure the new lug is not touching new epoxy (if it is you can remove material until it isn't).
If you can increase the temperature to around 120dF (hot box), this will make the epoxy more viscous (make sure the gun is level), increase the bonding strength and shorten the cure time markedly. I use a different epoxy with a higher bonding stength. Devcon sets in 16hours @ roughly 70dF=2500psi, so ~2650psi=120dF for 4 hours?
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