Correct tool for cutting into Fiberglass Deck

[rhtrades]

Does anyone have a recommendation on the best cutting tool(s) and blades to cut into Fiberglass non-skid Deck?  (I am replacing my deck core). 
Would an angle grinder work well?
Thanks

[RickK]

Most people use a skil saw and slide along the bottom of the liner. It leaves about 1.5-2" lip all around. Angle grinder will get the job done but you'll be all over the place with it.

[rhtrades]

Thanks Rick.  And would a metal cutting blade work well?    Also, do you have any recommendations on a brand of gel coat?   

[RickK]

I don't know how a metal cutting blade would do. Any blade you cut fiberglass with is going to get trashed. The deck is mostly balsa wood with glass on both sides, so a wood cutting blade is what I used. I bought my gelcoat at a local supplier, it came in a white 5 gal pail. Not sure it had anything but their store name on it since they buy in bigger qty and break it down into smaller qty.

[rhtrades]

Thanks Rick. 

[msteinkampf]

I tried a variety of oscillating blades, but none of them cut very effectively. I wound up using a 4.5 inch diamond blade for my angle grinder. Dewalt DW4701.  It’s marketed for cutting concrete. I cut out my entire deck, and it didn’t seem to dull the blade at all.

Expect a lot of dust.

m

[rhtrades]

Thanks M.  What thickness core did you use?