I'm taking out a seat pedestal but i cant get the rusty screws to budge, what do i do

This is a family site so I'll refrain from commenting.   ;)

Oops, I already did.

Place a block of wood over the head of the screws and then beat the hell out of the block with a hammer.  This will help break the rust loose and make them easier to remove.

If you can find some Kroil, it is an incredible penetrating oil.  If Kroil doesn't loosen it you will have to drill them out.

I had received a sample of Kroil a week before working on a steel hatch.  The bolts were rusty but we had managed to get the nuts off.  One bolt underneath the hatch was particularly stubborn.  We had beaten it with a hammer and tried rotating it for 20 minutes.  My husband suggested I try the Kroil so I sprayed some on it and went to make lunch.  When we returned from lunch it had fallen out and was lying on the top of the tank underneath.  

WD-40 is a good penetrating oil too. Generously spray and walk away. Come back later and try beating on it and turning it. Still no go. Drill it out.

Warning:-

WD40 is not a penetrating oil and is no match in comparison to standard penetrating oils and fades in comparison to Kroil.

While it may appear to have some penetrating qualities, WD40 is NOT A LUBRICANT.  Using WD40 on bearings, especially on the sintered metal bearings on small motors that are impregnated with lubricant, will cause rapid failure.  The solvents in WD40 will remove the existing lubricants and the bearing will seize up.

WD40 is a combination of solvents specifically designed to displace water, not lubricate.  WD stands for Water Displacement.

I agree with Ann's statments above.  I think I misused the term penatrating oil.  WD-40 dose help loosen rusty bolts though.

Wow, is Ann-Marie an engineer?