hey Bill;
im not too familiar with the shurhold line, but they have a great following. some pics of the hull and non skid would be helpful to see exactly what youre dealing with there...and that may help pinpoint product recommendations.
i am going to recommend strongly that you consider a rotary and a selection of wool pads for the boat. the gel coat will oxidize quickly, and a rotary will be your best friend, and you will definitely need wool to cut any oxidation IMHO. i have a flex and rotary for my vehicels, but ive only ever used rotaries on boats, and im talking yachts (used to do the clean-ups at Neptunus).
also if i may suggest, especially if the hull is white, to ensure your the compounds and polishes you buy are white. the porosity in the gelcoat may hold some spent product and dye/stain the white gel if not properly removed because of the pigment from the coloured compounds/polishes. we used to use aquabuff 1000 and 2000 exclusively and these boats were over 1 million bucks a pop...so if they trusted it, i feel confident i can recommend it...plus they did work great.
on other hulls that werent white, we would also use Meguiars products (mirror glaze #2 compund/orange and gritty to the feel, and medium cut cleaner i think? creamy beige and smooth), and they too were excellent products.
Also Duragloss has a great line of marine/gelcoat products and they are very affordable and high quality.