Rubber tyre additive?
 

It's probably been asked on here countless times, but what additives do people recommend. I've been told to go for mr33 or spider grip. The latter seem to come in different grades so it's raised more questions than answers. Any advice would be gratefully received:)

It will depend on where you're going to use it.
Drop Zen Racing a line, David will be able to give you advice and sort you out with the right stuff. He's a bit of an authority on that kind of thing.

I race at wlrc. Probably should have given the bit of info lol.

MR33 outdoor seems common in peoples set ups. Looking at the specs for Spider grip the yellow mentions the use of tyre warmers so that looks like the asphalt additive

Mr33 or Spider Grip Orange or Yellow.
Orange is best for low grip, Yellow when the grip comes up.
put on for 20 - 30 mins ideally with tyre warmers.
Wipe off before you go the track.

Spider Grip Blue & Green is for indoor carpet racing