Sand , primer , paint

[maxturbo]

I need some advise. I'm new to the boating world and I purchased a 2001 21ft aquasport CC that has bottom paint. Now the guy that had it before me repainted it 2 years ago. There are some spots that are chipping or peeling off. Question I have is can I just sand the chipped areas than primer it than paint it? And just roll over the good areas without sanding it down? The rest of the paint on the boat seems to be in good shape.
The boat will be put in the water from april to oct. Saltwater. What primer and paint should I go with? Thanks

 

[TheWoodCrafter]

Re: Sand , primer , paint

Maxturbo,
You can not apply paint over the old paint without sanding!
If the old paint is peeling in some areas it may peel next year in other areas.
I would strip all the old paint if it is peeling anywhere. It sounds like it was a bad job. It may not have been sanded first. The new paint needs a good 'Tooth' to stick. Sanding will give it that.
Others can steer you to a good bottom paint for storage in salt water.

 

[tashasdaddy]

Re: Sand , primer , paint

if actually anti foul bottom paint it is toxic, you have to take precautions when sanding. also anti fouling is not for trailer boats. as said above prep is 90% of the job.

 

[eastern27]

Re: Sand , primer , paint

You should remove as much of the old stuf as possible. Sand or use a soy based paint stripper. Primer depends on the paint. Assuming the boat is trailered, you will want to use a good co-polymer paint made for trailered boats. It has ablative qualities, is hard enough for trailering. It also dosn't lose it's effectivness after dry storage.

 

[Chris1956]

Re: Sand , primer , paint

Max, Newer boats have a vinylester(or other water proof) resin gelcoat which protects the hull from water absorbsion and blisters. To maintain the warrantee on hull blisters, the manufacturers do not allow the hulls to be sanded before bottom paint is applied. Also, most boatyards do not prime the hulls, prior to application of A-F paint. Since the mold release wax is still present on the hull, the bottom paint will chip off easily. This is why new boats have these unsightly chips, some of which are quite large.
This is likely what happened to your boat. Your options are to sand the paint the area around the chips smooth and then paint the bare spots, each year, or strip the paint off, prime the hull properly and then paint with an ablative multi-year paint. I always choose to strip it once and prime and paint it properly. It is a big job, but only needs to be done once.

if you do this, use a fiberglass paint stripper and putty knife to get off the bottom paint. Catch the paint and dispose of it in the garbage. Sand as little as possible to preserve the water proofing of the hull. Apply a two part epoxy barrier coating according to directions (Cure time of the paint is based upon ambient temperature), and then paint with two coats of ablative bottom paint.

BTW - The bottom paint may be sandblasted off the hull w/o damage if a soft blasting media is used (fine walnut shells or baking soda)

 

[maxturbo]

Re: Sand , primer , paint

Thanks guys for all ur inputs. I'm still not sure if I'll be trailering the boat every weekend or put it in a slip. And keep it in the water for the season. But I do have to get the boat painted and soon. I wanted to get it soda blasted or sand blasted but nobody around central Jersey does it. I would have to drive hours to get to a place for them to charge me 1000 for the soda blasting.