For EPS Blanks, we recommend setting X-2 plugs with 2 separate resin pours so the resin doesn't exotherm and melt the EPS foam.
Fill the drilled X-2 hole about 1/4 to 1/3rd of the depth with resin (just a little) and set the plugs in. Then when that's cured fill the rest of the hole with another batch of resin.