Can you give me an idea of what it would cost to get the Interlux Interprotect system done on a Mac 26M at a local marina?
once you have blisters, they need to be addressed before you proceed with the interprotect process described above. Cut them open, let them dry, fill with epoxy, fair and materials, haul and block, yard rent.
Ball park to have it done at a local marina is in the several thousand dollar range, as the materials and labor are fairly high. Various parts of the country have higher labor rates.
On the Chesapeake, to deal with the blisters you may have (not scaling the gelcoat off)individually and allowing them to dry and then fill with epoxy and then fair them for a 26' would be at least $1K depending on the number and mat damage to open them, most marinas will want 6-8 months or two seasons to dry them...Scaling the glass and replacing would cost more than the boat, and not guarantee they will not return. See the web at Hartges marina for some details of the process.
Interprotect is about $75 a gallon, marina price, factor in materials and labor for the 4 coats described and you are real close to another $2K.
Good bottom paint to adhere to the 2000e is +$100gallon marina prices, and labor will likely bring that piece to $1K, as most marinas who offer bottom paint by the foot, offer generic materials - not this good stuff.
Not sure why you would be getting blisters in the colder waters of MI, as it is most likely associated with warm water...unless McGregor is using less than stellar resins...still.