Let me add to Dennis’ apt observations: if you choose the spray-painting route you will need all the supporting equipment to make it happen, i.e., a very large compressor to run that pneumatic board-file and more importantly, to get the correct airflow pressure and rate at the spray gun.
These are issues that I am dealing with at the moment. The compressor that I am using doesn’t “quite” have the ability to constantly supply 90 psi at the gun. This has not been a problem when shooting the primer but I expect that it will be when I go to shoot the top-coat. I’m mulling this one over right now; do I try to get by because I’m shooting very little area that is gloss or do I rent a larger compressor? One option I have is to gang another 30-gallon tank to the existing one. We’ll see. If you go ahead and paint your hull you will find the axiom that preparation is 90% of the job to be accurate. I would completely remove any prior paint. The spraying part is not the ‘hardest’ part. And keep in mind as I did, if you use Awlcraft 2000 or something similar, you can always come back and fix the mistakes. A new paint job on the hull is always nifty. Best, Dave Godwin 1982 C&C 37 - Ronin Reedville - Chesapeake Bay Ronin’s Overdue Refit <http://roninrebuild.blogspot.com/> > On Oct 24, 2016, at 11:41 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > Randy, > > If you don't KNOW what paint is on the topsides, then the best course is to > sand it all off. You could try priming over the old paint but you may > encounter compatibility issues. > > When I had Touche' painted, we did not know what the previous paint(s) were. > Rumors around the marina were that it was Imron but nobody knew for sure. > > I prepped the topsides paint by washing with degreaser and sanding with 320 > grit. We sprayed a 3' x 3' test area with Awlcraft, the chosen paint. In > that small area, the test spray beaded up on the old paint, reacted with the > old paint and generally did some other bad things. The ONE thing it didn't > do was lay down smoothly as desired. Oops!! > > So, I sanded the old paint off. I counted at least 2 previous coats. It > took one day per side. I used a Hutchins straight line sander similar to > this: > > https://www.hutchinsmfg.com/View-Product.aspx?group_id=4346 > <https://www.hutchinsmfg.com/View-Product.aspx?group_id=4346> > > The results were very good. Touche', like many older boats, showed post cure > shrinkage. That is, you could see the pattern of the underlying roving on > the hull. The Hutchins sander removed the pattern leaving a smooth hull. > This is important when spraying a shiny top coat. Repairing all the > blemishes and having a smooth hull prior to painting is critical. It took > three coats of high build primer with sanding between coats to obtain a > suitably smooth hull. The sanding was followed with a top coat of Awlcraft. > I get compliments on the paint 5 years later. > > Spraying paint isn't incredibly difficult but it does take patience and > technique. The right combination of air pressure and liquid/air mix takes a > bit of work to achieve. Finally, the application technique requires skill to > maintain the correct distance as well as trigger on/off when spraying. A bit > of practice can develop your skill. > > Interlux Perfection is billed as a paint somewhat geared to the DIY market. > > BTW, years ago I picked up a Wavelength 24 in Fort Collins and brought it > back to Louisiana. I picked it up from a marine repair/paint shop. Very > nicely painted by the lady owner of the shop. Can't remember any details. > She used Sterling enamel. > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > On Mon, Oct 24, 2016 at 9:54 PM, RANDY via CnC-List <cnc-list@cnc-list.com > <mailto:cnc-list@cnc-list.com>> wrote: > Listers- > > I've come to the conclusion that Grenadine's hull is painted the same color > as her original gelcoat (red). It appears a coat of grey primer was painted > over the original gelcoat, then a layer of red paint was applied. I have no > idea what kind of paint was used (is there a way to tell?) or when the boat > was painted. What I do know is it's probably time to repaint. She oxidized > pretty badly over the course of the summer, even though I buffed her three > times with a 3M marine product, and waxed her with carnuba, before splashing > her in the spring. She looked pretty good and shiny back then, but the > summer sun took its toll. > > So anyway, my question is, what wisdom might you listers have to impart, > about the proper way to paint over a painted hull? Grenadine is on the hard > for five months now, and I'm not afraid of hard work. > > Thanks in advance. > > Best Regards, > Randy Stafford > S/V Grenadine > C&C 30-1 #7 > (on the hard in) Ken Caryl, CO > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray <https://www.paypal.me/stumurray> > > All Contributions are greatly appreciated! > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you wish > to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated!
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