Chet, computers these days run above microwave frequencies internally. And at that range, every part of the circuit board, even the traces themselves, are active components. So you will be changing (de-tuning) the circuit board and you stand better than a 50-50 chance of making the computer unstable.
And that's not counting the overheating it can cause.
Might work, might not, but anyone in the business of making those computers will tell you they don't offer them coated--because it would be a major redesign job to try making them work reliably afterwards.
I know folks who find cell phones, CD players, MP3 players, laptops, never last them more than a year or two. And others who get 5++ years from the same devices. Sometimes, the only difference is in how you use and care for them. Treat a laptop like a book, and yes, it will break before two years are up.