Styrene turning board yellow

I just finished lamming a board and there were a couple spots that after it dried in our hotbox dried out. If this has happened in the past I would rub a little styrene on it and that would allow me to use my finger and massage some resin into the spots and fix them. But today I did that and it left yellow spots everywhere I put the styrene. I tried wiping acetone on it and I still couldn’t get rid of the yellow spots. Has anybody else had this problem? Any suggestions on how to fix it? Thank you so in advance for all the help!

Any thing changed, Set Up, Glass/Resin or Styrene?

Styrene tends to yellow as it ages; better always use a new can/bottle.

…always happen that; no matter if the styrene is new.
There s no solution cause was drained into the foam.