David Jenkins
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| posted on 6/7/04 at 12:18 PM |
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Painting new GRP
Yes, it's painting GRP time again! 
I will shortly be painting a nice new shiny bit of GRP (no repairs - a virgin surface). The final coat I want to put on is cellulose - I've
already got it, and the colour matches my existing GRP perfectly.
Presumably I need to 'wet & dry' the gelcoat slightly to get a matt surface, using very fine paper. Should I have to follow this with
a special primer, or will the usual stuff be OK?
rgds,
David
[Edited on 6/7/04 by David Jenkins]
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Peteff
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| posted on 6/7/04 at 12:46 PM |
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I painted my nosecone after I hit my bike with it, I just did same as when I paint anything else, rub down with 800 or 1000 wet and dry to take the
shine off. I primed it with a few coats of ordinary celly primer and flatted it with 2000 grit then gave it a few topcoats. I like cellulose as
it's more forgiving. Make sure you wash your hands first or use surgical gloves as you can easily contaminate the surface if you have oil or
grease on your hands and may end up having to use isolater which is dearer. Mark Allanson's the one to get on the case for this job I think
[Edited on 6/7/04 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Hugh Paterson
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| posted on 7/7/04 at 09:03 AM |
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I use Awlgrip on punters boats on request, I use epoxy hibuild primers from the automotive world on my own stuff. works fer me Nowt wrong with
good old cellulose though, as long as u make sure that you have removed all the wax or release agent that tends to cling to fresh grp yer cooking.
Dont you just luv the smell of cellulose, everyone needs a fix now and then
Shug.
[Edited on 7/7/04 by Hugh Paterson]
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Mark Allanson
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| posted on 7/7/04 at 04:11 PM |
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If you are using celly, you can buy aerosol etch from automotive paint suppliers, quite cheap and aesy to use - don't try and put it on too
heavy, a couple of dust coats will do it. remember it is only to provide a good cohesive layer, not for transparency coverage.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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David Jenkins
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| posted on 7/7/04 at 06:29 PM |
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Mark,
Is that a special etch primer, or the normal acid etch primer for metals?
rgds,
David
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Mark Allanson
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| posted on 7/7/04 at 07:26 PM |
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I haven't looked at the composition, but we use it on all the small jobs that don't justify a separate bake for the etch - excellent
stuff, never a problem and we do a lot of ally bodied cars, and plastic panels
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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NS Dev
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| posted on 7/7/04 at 11:18 PM |
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yep, not an expert on painting but the activated cellulose etch primer (that's what I got when I asked for "cellulose etch primer"
sticks like the proverbial to seemingly any surface (desired or not!) and is a great key for the later celly coats!
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thekafer
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| posted on 8/7/04 at 02:42 AM |
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Always wipe a new part down with a solvent before sanding. If the manufacturer does'nt remove whatever mold release he used you will sand it
INTO your part!!!
Fletch,
I'd rather have a bottle in front of me than a frontal labotomy...
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David Jenkins
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| posted on 8/7/04 at 07:26 AM |
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quote:
Originally posted by thekafer
Always wipe a new part down with a solvent before sanding. If the manufacturer does'nt remove whatever mold release he used you will sand it
INTO your part!!!
That's logical when you think about it... thanks, Fletch!
(this is one of my weekend jobs, if the current high winds & rain don't wreck the house! )
David
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marc n
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| posted on 8/7/04 at 07:49 PM |
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panel wipe the parts first then using a scotch brite should suffice on the preparation front, as long as the fibreglass is good quality, we normally
then go over with panel wipe five or six times before painting,
regards
marc
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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David Jenkins
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| posted on 9/7/04 at 07:35 AM |
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Unfortunately the GRP is not best quality - it's going to need a bit of filling here and there, plus a bit of 'restyling'.
Can you get panel wipe in small quantities, or will cellulose thinners (Xylene) do the job? I've already got some of that! Or will it attack
the GRP surface?
David
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timf
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| posted on 9/7/04 at 08:32 AM |
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david if you want a small quantity i can decant you some into a jar if you want
i have a 5l tin in the garage
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