xps foam, dow expandable foam and drylok issue

[jonny5]

so I started painting my background a day or two ago but in alot of these small little crevices the drylock will not get into because it is so small. The more i try to get to the little spots the more the area around it gets risen and all my hard work into carving slowly starts to get nullified as my contoures get more shallow the more drylok/paint i add.

So can i leave all the little spots uncoated or will this harm my fish? if the xps/expanding foam is waterproof and does not toxify the water it should be ok right? or should i try to get all the little spots filled in?

[Lady Hobbs]

The expantable foam all needs to be totally covered. Most cover it with cement when you cover the foam. Never done it but read a lot about it because I was going to do it myself.

[jonny5]

ah i thought so, was just hoping for a ," na go ahead and be lazy it will be fine." lol. Its going to be tedious but my background will look nice.