For trying extra fins on boards with no provision for extra fins.
Small fins set on thin glass plates, all faired & foiled for good flow.
They are simply stuck in place with, silicone or sikaflex for a stronger bond.
A sharp scraper should remove them with little drama.
Will it work

I will let you know.....
Today we have a slightly wind affected swell with sets up to 8' An off shore squally wind up to 30knts at PRK. The waves inside the point were clean up to 4', it was a good wave to try fins.
I had to drop Jarrod of at school so was late for the low tide & was in a rush to try the stck on side fins. I taped them on securely & neatly with duct tape, with no drag points. I thought I would at least get a few waves before the started to peel off.
That is almost what happened.
The fins made the board noticibly faster to paddle out, extra area of the combination reduced yaw.
Spinning for a wave was slower, but the acceleration to catch the wave was higher.
Riding, the board speed was reduced slightly & a little stiffer in turns.
On the 4th wave, after a dozen bottom & top turns down the line, at the apex of a high speed round house, the board suddenly accelerated & became looser, projecting further & faster, making a harder hit of the foam....!!!???
......the fins ripped off instantly due to the high speed cutback.
The fins both comming off probably was the best thing that could have hapened for the test, I was able to feel in an instant what the difference was, it was clear.
I am sure the fins would be a benifit on a more powerfull wave where the board is being laid right over & the large single fin is close to the surface, I have felt the board slide & regain track many times in this situation, as it breaks out or ventilates momentarily.
Was slight pissed that now some fish was probably tryin some new fins.
I have a bag of about 100 china rejects so cost zilch, They were going to end up on Adams board to set it up for heli's