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Author Topic:   priming outboard
specktrout posted 08-15-2001 09:16 AM ET (US)   Profile for specktrout   Send Email to specktrout  
Thank you to everyone for all the advice in painting my lower unit. One last question: Although I have sanded all the chipped paint and areas of corrosion, I still have a large amount of original paint in good condition left. Can I paint over these areas witht he zinc phosphate primer, or does everything need to be sanded completely? Thanks again
Bigshot posted 08-15-2001 09:39 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Zinc is for painting bare metal. Just paint over the rest that is factory, not prime.
bigz posted 08-15-2001 10:01 AM ET (US)     Profile for bigz    
Specktrout, if you haven't painted the bare areas yet would suggest zinc chromate not phosphate (poor substitute) if you have no big deal (contrary to some it is still available to consumers in spray cans).

On the good paint rough it up with dry 180 grit remove dust with paint thinner and then spray the finish color --

Just before the first coat is dry, still tacky, hit it with a second light coat. Let those dry overnight.

At this point you have I guess a uniform finish over the entire unit.

Now wet sand with 220 and give the entire unit two more coats as described above (make sure it is dry after sanding). Again let dry for 24 hours. Now use a auto rubbing compound to even out and blend the finish, then wax. It should look great. Tom

Dick posted 08-15-2001 10:10 AM ET (US)     Profile for Dick  Send Email to Dick     
Tempo still makes zinc chromate primer in spray cans.
#5606 yellow
#5605 green


Bigshot posted 08-15-2001 11:09 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Did not read the phosphate part, sorry! Use Tempo zinc chromate(green lid).
bigz posted 08-15-2001 11:32 AM ET (US)     Profile for bigz    
Thanks Dick appreciated, didn't have those Tempo paint numbers handy.

Found you can also get quarts of fast dry zinc chromate from Petit -- say if your refinishing an aluminum boat --- we used it on our little Mirocraft tough as nails, then sprayed on the finish coats --

One thing on aluminum it has to be coated ASAP after sanding or sand blasting the dang stuff will start to oxidize almost immediately depending on the humidity level ---


andygere posted 08-15-2001 12:02 PM ET (US)     Profile for andygere  Send Email to andygere     
Tempo suggests waiting as long as 30 days before waxing or polishing to let the paint fully cure. My experience is that the top coat is pretty fragile for a while, and I suspect the solvent in the rubbing compound may take the paint off if used right away.
bigz posted 08-15-2001 12:50 PM ET (US)     Profile for bigz    
Andy yep I know what the can says! Thanks for reminding me. I should have mentioned it before to eliminate any confusion.

If the job is done in 70 degree + weather in 48 hours you will find it tough as you want it to use the rubbing compound to blend the finish. Hand rub not machine rub figured he wouldn't use a machine on an outboard but should have mentioned it. Yes a little paint will rub off the idea is to blend it in so that it looks uniform and polish it out.

Say even leaving it over 3 to 4 days compounding won't touch it. By 30 days holly mackerel might as well sand it again and re-spray --- this has been my experience --- Tom

jimh posted 08-15-2001 06:35 PM ET (US)     Profile for jimh  Send Email to jimh     
I think the difficulty I have had in obtaining Zinc Chromate primer may be due to some local restrictions in place from the state of Michigan. Everyone else on the planet seems to be able to get it without problems.


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