I agree with John's comments.

You should tell what type of boat you have and where the boat was used.

Here the commercial lobster fishermen are emptying their cages while their
boats are moving on autopilot steered by GPS.

In heavy fog, the boat keeps moving and the working fishermen do not always
hear the sound of the radar watch and carry on with their work.

It is not unusual to see pleasure and commercial craft that have been
T-Boned (struck on the side) by another boat.

Alternatively, during the start up of a club race on a clear day some
sailboat does get T-Boned. Usually you can see some damages on the toe
rails and the tip of the freeboard has been pushed in and at time a crack
goes down to the water line.

On average a well-repaired boat will not shown any signs of having sustained
puncture damages. In your case, the patch is eye-catching let hope there is
no hidden damages.




"John Cassara" wrote in message
...
Can you see the inside of the hull? The patch may be a reinforcement for a
damaged section of the hull. You could be opening up a "can of worms"


wrote in message
news
If you do not need to remove this patch do not do it. If it is a must
for you to remove I would use abrasion or lever action. If prior to
applying this patch the hull was not de-waxed or clean with chemical
agent chances are that the bonding is not 100%. I you can find
de-lamination between the hull and the fibreglass patch I would insert a
thin oak wedged scrapper and push it out gradually. If this fails I
would use a auto body file mounted in its holder to shave this patch
away. Failing to this I would use a dual orbital sander with extreme
care as to not de-formed the shape of the freeboard.
The freeboard will have to be faired out with premium marine filler,
painted and blended with the rest of the color.
Maybe someone has better ideas?

"Jim and Becky" wrote in message
...
My boat has a 3'x3' patch of heavy non woven matt fiberglass on the
hull
from the gunnell to the waterline.
It was used to protect the hull as lobster traps were hauled into the
boat.
Its ugly.
The hull is balsa cored.
What is the best way to remove it?