Bought a worktop jig to join my worktops with a mason mitre joint, if I do the first pass with a router can I use a fine tooth saw and follow the line of the router or is it better to make a few passes with the router till the cut is complete.
Thank you for any help

Hi Eddie

The main point of using a router template is that it is so designed to precision cut both sides of the joint, male and female.
Wolf is correct about taking your time, practise first if you havent done one before; the first time I did a worktop I used sections of the old worktop I ripped out to practise on before I tried machining the new worktop. Also a sharp (preferably new) cutter is ESSENTIAL even if it costs a bit. The trend replaceable cutter type are good. The hire shop (if your hiring) should supply a cutter for free or at least reduced price. Watch out they dont try to palm you off with an old blunt burnt out cutter, it will only cause scorch mrks and a rough surface. Also 1/2 inch capacity is essential try to hire a makita or elu, powerful as you can get. Also do the cuts in several passes, about 10 mm depth at a time instead of trying to do it all in one pass, less strain on the motor and a smoother more precise finish.
Hope this is of help
cheers Jonathan

I told not to mention ripping outthe lamiate

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just to add to chippys comments

most jigsaws that "wander" will only do so in one direction as in to the left or right
so if youve sussed out which way it may wanders providing its only an occasional wander you can cut along the line making sure that if the blade "wanders" its to the waste [or less important side]

Another thing to remember is to make all your cuts with the router tight against the outside of the joint and make the last pass tight to the inside of the joint  for a full clean cut.