Technical, Techniques, Hints, and Tips > Painting, Finishing and Care.
Halfords aerosol over varnish - "wrinkling"
clockworks:
I'm finishing an Aeronaut Diva, which has a sheeted over frame hull. The bottom of the hull is normal birch ply, the sides of the hull are mahogany-faced ply.
I used sanding sealer over the whole hull, then several coats of Ronseal Yacht Varnish on the upper hull.
I masked off the mahogany areas, leaving the lower 5mm or so exposed, and sprayed on a couple of thin coats of Halfords white primer. The exposed varnished areas have wrinkled badly, so I'll have to sand back the hull and start again.
This is the first time that I've tried to build a boat with a part natural wood/part painted hull, so I've not tried painting over varnish before.
What paint and varnish would you recommend that I can use together without causing problems? Needs to be something that I can brush or spray from a can, and that I can actually buy during lockdown.
DaveM:
Before Mr Jones leaps in with his advice/critique, I'd be very wary of using a solvent-based primer or paint over an oil-based varnish. Halfords white primer is rubbish anyway - it never seems to set hard. I'd suggest an enamel matt coat for the white primer/base and a similar gloss for the top coats. You can get Humbrol from most model outlets by mail-order, even in these strange times.
DaveM
coch y bonddu:
Mr Milbs is 100% correct the varnish is enamel the aerosol is acrylic hence chemical reaction...as for the white primer dont even get me started best place for that is the bin.
Dave
Colin Bishop:
One further minor point. Yacht varnish is intended to be a final decorative/protective coat and is slightly flexible to acommodate thermal movement on full size boats so as well as being affected by solvents from spray cans it doesn't really like anything else on top so you are quite right to sand back to the hull in ny event. Don't worry too much, most of us have been in a similar situation!
Colin
clockworks:
Humbrol primer (or matt white) and Humbrol gloss white aerosols over the Ronseal varnish should be OK then?
I'd rather not sand the whole hull back to bare wood, as the deck and coamings are all glued in place.
I agree about the Halfords white primer being a bit rubbish. Very odd, since all their other aerosols seem to work so well.
What is the best primer to use under the lighter Halfords top coats?
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