Removing seized pedal

Having quite a bit of bother removing a pedal from the crank.I have ran out of ideas how to get the pedal off...thought it would have been handy enough cos I used the copper grease when I put them on....one came off easily enough but the other is a different ball game
Anyway has anybody got any ideas or tips how to get it off
TIA
Anyway has anybody got any ideas or tips how to get it off
TIA
Lapierre Aircode 300
Merida
Merida
0
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Ridley Fenix SL Ultegra Di2 - 2020 (Summer Bike)
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Merida
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I had the same situation recently with a pair of pedals that had been on the crank less than six months and greased when fitted, not helped by the 8mm allen key needed, not a pedal spanner to remove them.
1. A pedal spanner with looooonnnnnggg lever
2. Penetrating oil(spray on and leave over night)
3. Heat up the cranks, but not the pedals
4. Use some thing like finish line chill zone on the pedal axle to bring it to extremely low temperature
5. Do both 3 and 4
6. Yank the cranks and pedals off, toss the in the garbage, get a new one, and remember to use antiseize this time.
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
Use it with the door and windows open ............
I've always ridden with SPD pedals but recently switched to SL. the SPD's were so stuck I ruined multiple allen keys. I bought a larger set and some creeping oil and I tried to apply as much force as I could with my foot. It came out eventually.
The joy was immense.
Worked for me anyway !