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Thread: Talcum powder + undercoat
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4th May 2010, 11:43 PM #1Senior Member
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Talcum powder + undercoat
Hi guys. has anyone used talcum powder mixed with under coat as a filling aid.
An old shipwright once told me that was how he got a good finish on an old boat he was working on.
I have been stripping the big boat back to the dynal sheath as thirty years of paint is cracking and falling of. I have stripped the aft cabin hatch and housing ( these bits are in the shed) back using paint stripper and the usual mechanical devises and given them 2 coats of yacht primer, one coat of precoat and one coat of precoat mixed 50/50 by volume with cheap baby powder. The 50/50 mix has filled the dynal "dimples" nicely ready for a coat of top coat before fitting back on the boat. Am I doing the wrong thing.
Next question, when refitting the hatch house and misc deck fitting (winches, cleats, etc) should I fit them on the bare dynal with sikaflex or finish the painting then whack the fittings on and seal around the sikaflex with top coat ( my prefered option ).
Ian L
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4th May 2010 11:43 PM # ADSGoogle Adsense Advertisement
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5th May 2010, 12:01 AM #2
I used to do my model aeroplanes with talc and dope (model aeroplane dope - celulose laquer), then paint over the top, so it might work for you.
Richard
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5th May 2010, 12:27 AM #3
I am, showing my age.
In the 1960's, we only had industrial talk.
Very heavy.
Very rigid.
You are better off now.
Paul.I FISH THEREFORE I AM.
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5th May 2010, 11:52 AM #4Senior Member
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Are we talking about talcum powder made from TALC
or made from cornflour
I think baby talcum powder is now cornfour
talc was found to have some asbesos in it
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5th May 2010, 12:50 PM #5
Industrial Talc, use to be available from where ever you bought your Fibrglass supplies.
With todays HIGH BUILD undercoats, I don't see the need to ruin paint by adding anything to it.
You may be right about cornflower in Talcum powder. I don't really know.
Paul.I FISH THEREFORE I AM.
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5th May 2010, 01:25 PM #6
Real Talc Talc - Wikipedia, the free encyclopedia interesting
asbestos not found, but talc itself may be carcinogenic
Baby powder probably is cornflour, not talc, despite what the label may/may not say...
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5th May 2010, 02:05 PM #7
From the baby powder info page on the website of a large well known company :
"Keep powder away from child's face to avoid inhalation, which can cause breathing problems.
Ingredients
Talc, Fragrance"Cheers, Bob the labrat
Measure once and.... the phone rings!
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5th May 2010, 05:04 PM #8
The simple answer is yes, you can add talc. The not so simple truth is how much and what's already in the undercoat. Most all primers have some fillers added; talc, balloons, silica, etc.. If you "over weight" or "over bulk" the primer, the particulates may not remain in "suspension" and possibly a lose of adhesion too.
If you have a good bit of surface imperfections to take care of, do it right and use a skim coat of a filler, then prime as needed to start the smoothing stages. In other words, high build primers are great at smoothing, but very wasteful at leveling. Level the surface, then smooth the surface is the most economical method.
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5th May 2010, 10:51 PM #9Senior Member
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Gentlemen thank you for all you advice. My memeroy has been jogged re Talc from the fiberglass mob, in fact I used it some years ago on the plastic boat.
Par I hear what you say re filling capabilities of modern paint, but I guess I am a bit lazy and I know I am broke hence trying to use the least amount of paint. The whole exercise is trying to save time also, I only have two days every fortnight to strip and paint 32ft, less rain and club happy hours I should be finished in time to start again.
Bring on retirement.
Ian L
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