1. Find out what is on there now2. go to Interlux paint web site and get information about the various bottom paints from them, or/and go to West Marine and get the Interlux booklet on bottom paints.3. The 29.5 is a relatively new boat and PROBABLY (?) does not have a build up problem, especially since the previous owner said it needed painting. 4. I HIGHLY recommend an abalative bottom paint. Interlux Micron CSC, Interlux ACT, West Marine CCP (made by Interlux!). MOST LIKELY it will be able to be put on over what you have on there with a good sanding, but find out.5. If so, you will bless the day you used the abalative paint because:a) No more sanding except for fairing in any chips and bare spots.b) No more buildup because Abalative paint is designed to ware away as the boat moves through the water taking with it any barnacals, weed, etc.c) BECAUSE it is designed to ware away it uses less copper content!!!d) Except for Interlux ACT they are Multi-Season paints. They go dormant in the off season when hauled. When ready to launch simply scrub with a stiff brush and water and launch IF THERE IS ENOUGH PAINT STILL ON THE BOTTOM FOR ANOTHER SEASON.In theory the abalative should be applied in two or more coats with each coat expected to last a season. 4 coats=4seasons. In actuality, you will find it necessary to fair and paint bare spots from peeling and you will want to add new paint to the leading edges which ware faster for obvious reasons. I went to abalative paint several years ago and will never go back. My lungs are too valuable to breath in sanding dust (even with the best mask/resperator). The stuff gets in you pores.Sorry for the lon winded answer, however, I hope it helps.Good Luck,PAT