how tight

[steplift20]

I want to install a transom bracket plate on my out board cause i had to have a shop remove it to out on the steering cable, And when they put the top 2 bolts back on the left washer broke thru the gel coat[thats what you get for having someone else do the work
so how tight does those bolts go on? the top ones
im going to seal it with 3m4200 and then the bracket,that should work what do you think