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#1
posted to rec.boats.building
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Fiberglass and Print-Thru
I have an 35-year-old f'glss sweetheart that needs hull paint. It's
white now, and I lean to a darkish color like a flag blue. But one paint guy has warned me about the possibility of print-thru on dark colors. Can anyone shed some light on this? How real is that possibility? What causes it? Any experiences? Arnold Shore Annapolis, MD |
#2
posted to rec.boats.building
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Fiberglass and Print-Thru
The term 'print through' generally refers to the coarse woven-roving
fabric used in a hull lamination lay-up being visible on the outside of the hull. This is why - when hand laminating a hull - a layer of mat is laid first into the gel-coat; the mat 'hides' the weave of the subsequent woven fabric. In a chopper gun lay-up, where a slurry of chopped fibers is 'sprayed' onto the gel-coat, any "holidays" by the operator might allow the woven fabric to 'print-through' , meaning that on close inspection of the finished hull you'd see a 'small waffle' pattern in the finish. Dark coloroed hulls do require a higher level of finish that do light (white) hulls. This has something to do with the mechanics of our eyes ( a subject way beyond my ken). Anyway, if you're going to paint her, a dark color shouldn't be a problem, even *if* your hull has print-through (which it may not - one can see print-through even on white hulls with careful inspection) PROVIDED you can commit to thorough preparation of the hull surface. If your Sweetheart really wants to shine, the best choice is a two part LPU, the final finish of which has been preceded with filling / fairing and a couple of coats of epoxy primer. This may sound daunting, but isn't too bad. Interlux has a cool on- line video that shows the whole process for thier 'Perfection' product, generally applicable to Awlgrip, etc. MW |
#3
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Fiberglass and Print-Thru
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