Drilling drain holes in epoxy mold
I was wanting opinions on drilling drain holes in epoxy, in regards to drilling direction to best avoid chipping and excessive damage. Do you go from the outside in, towards and emerging through the detail or start from the inside and drill out so you can aim more precisely and choose placement better on a highly detailed mold? Also drill bit types and sizes that are commonly used for this task on a mold of a bust would be very helpful. Thanks!