Share
Welcome to the Bunnings Workshop community @zeonjoseph. It's great to have you join us and many thanks for your question.
It is quite possible that a drill with more torque will assist. An impact drill would certainly have a better chance at removing the seized bolts than a drill driver. However, I would advise not using a drill under these circumstances due to the risk of burning it out.
Give the bolts a good soak with WD-40 and leave them for a few hours. When you come back, give the bolts a few good hits with a hammer to loosen any rust. I would suggest using either Kincrome 11 Piece 1/4" And 3/8" Drive Metric Hex Socket Set or for more torque the Kincrome 11 Piece 1/4" and 3/8" Metric Long Hex Socket Rail on a ratchet. You can also purchase a Kincrome 6mm 1/2" Drive 140mm Long Hex Bit Socket separately if you would like.
By using a socketed hex bit you will be able to put a higher amount of torque on the bolt than what a drill could apply. You can also then look at extension bars (or a piece of pipe) if a standard rachet isn't long enough.
Let me mention the helpful members @Stuardo, @JDE and @Kermit to see if they could add to the discussion on stuck bolts.
Please let me know if you need further assistance or had questions.
Mitchell
Hi Mitchell
Thanks for that. I will try out the WD40 first. I did see that idea of hits with the hammer. It does make sense but was worried about damaging the bolts. Some good options in here. Will give it a try and keep you posted. Thanks 
Several light taps with a hammer might have been a better description. You certainly don't want to start deforming the bolt heads. Are you using a hex bit in the drill already? Instead of putting it in a drill can you attach an adjustable spanner to the bit? That would allow you to gently tap the end of the spanner with a hammer to encourage it to turn.
Mitchell
I'd try tapping the end of the adjustable spanner as in the picture I've taken below. I'm sure some experienced members will cringe at this, as it does do some damage to your spanner. It won't destroy it but it's not good to do it excessively as it causes play in the jaws.
Mitchell
"The seat is screwed on with 6mm allen screws"
That's a fair size to safely use some external elbow grunt. Rather than go down the "best power drill" path I'd try a dedicated 1/2 inch 6 mm allen socket with an extension bar. Prior to this, squirt some of the new WD 40 Penetrant spray first.
