I have an old, cracked Formica counter top.

First call an exterminator for an inspection so they can show you how and where they are getting in, then screen off or plug all points of entry. Then get no kill traps and bait with dollar store peanut butter. Here is an example, they are sold almost everywhere.

https://www.amazon.com/dp/B000YFA7HW/ref=asc_df_B000YFA7HW5280221/?tag=hyprod-20&creative=395033&creativeASIN=B000YFA7HW&linkCode=df0&hvadid=167116476898&hvpos=1o3&hvnetw=g&hvrand=16809330886861154001&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9031180&hvtargid=pla-502924060792

I have a couple and they are very successful. I just take them down the road a bit and release in a field where they have water access. I live in a semi rural area. Easy, cheap and humane.

https://youtu.be/mnONl72We0g

REPLACE-- with new, modern, up-to-date- materials-- you will be happier in the long run, and say "why did I wait so long!!!!!" White quartz is wonderful! Doesn't stain, doesn't need to be sealed, lasts forever, and well-- is generally less expensive than all of the OTHER new fangled countertops-- GRANITE is a NUISANCE (I know...) By all means WHITE!!!! It's clean, bright, lightens up dark rooms, looks gorgeous, you can see "what's ON IT" ... and very trendy! Makes for a fantastic place to roll out pie dough, or knead your bread dough too!!! GOOD LUCK!

Don't rule out another laminate counter top. There are some unbelievable laminates now. Go on-line and look at all the colors and styles in WilsonArt and Formica. There are even some lesser known laminate manufacturers that make some really great stuff.

Sorry, but the question is about Formica.....not bugs☺