CRAFTSMANSHIP
1 2 3 4 5 6 7 8 9 Nine product comparison table
PRODUCT DESCRIPTION
SINGLE-POT CONVENTIONAL VARNISH 1 Jotun Penguin Ravilakk
2 Seajet uv 3 Nauteco Coma Bernice
FLEXIBLE POLYURETHANE 5 Uroxsys
COATS COVERAGE COST/LITRE COST m2 (1)
(2)
Alkyd-based with Chinese wood oil, synthetic amber and ‘other materials’ Phenolic alkyd base with tung oil and 5 ‘traditional ingredients’ Alkyd-based
5
TWO-PACK VARNISH 4 Seajet Polyurethane Gloss Hard polyurethane + catalyst
Topcoat aliphatic fl exible PU Used with Uroxsys primer
EXTERIOR WOODSTAIN STANDARD (50%) SOLIDS 6 Sikkens Cetol Marine/International Woodskin** 7 Sikkens Cetol Filter 7
EXTERIOR WOODSTAIN HIGH (75%) SOLIDS 8 Sadolin Ultra with base coat Base coat Ultra
9 Sadolin Ultra
Table notes (1) Primer(s) included where applicable. (2) Claimed m2
/lt on a single coat basis. (3) Cost per litre (£), 2009. 1 JOTUN PENGUIN RAVILAKK
App Five coats, the fi rst thinned about 30% with white spirit, the second given a light de-nibbing with 400 grade paper. The fi ve-coat application spanned fi ve days. 30 months Totally intact on surface and all four edges. It has however lost its gloss, which has become a low level sheen. To retain gloss a fresh top coat should perhaps be applied as soon as possible afterwards.
2 SEAJET UV VARNISH
App Five coats, the fi rst thinned about 30% with white spirit, the second given a light de-nibbing with 400 grade paper. The fi ve-coat application spanned fi ve days. 30 months Intact on surface and three edges but a small, recent fi ssure along the top edge, with a small amount of detachment. High level of gloss.
3 NAUTECO
App Five coats, the fi rst thinned about 30% with white spirit, the second given a light de-nibbing with 400 grade paper. The fi ve-coat application spanned fi ve days. 30 months Totally intact on surface and all four edges. It retains a high gloss.
Ultra only 16 12 5* 4
5 1
3 3
1
2 3
10 16
12 15
16 16
13.5 13.5 13.5
(4) Based on the number of coats given in column 1. (5) Based on £12.50 (aliphatic) and £1.20 (primer). (6) Based on £0.89 (base coat) and £2.48 (Ultra). (7) Based on £6.66 (epoxy) and £6.56 (2-pack).
4 SEAJET POLY’THANE GLOSS 2-PACK VARNISH
App The 6-coat system spanned two days. Since no evaporation is involved this application will have a signifi cantly higher build than solvent or water-based fi nishes. Coats were applied at 20min intervals, wet on wet. 30 months Totally intact on surface and all four edges. It retains a high gloss.
5 UROXSYS FLEXIBLE PU
App Primer applied in warm conditions and allowed to cure overnight. Five coats of Marine Aliphatic (top coat) applied at 2-hour intervals, de-nibbing third coat. Six-coat application takes one to two days. 30 months Totally intact on surface and all four edges; retains a high gloss and a light nutty tint.
App Three coats, the second de-nibbed lightly in preparation for the third. The three-coat system spanned three days. 30 months Totally intact on surface and all four edges. Level of sheen not degraded, although not comparable to the gloss retained on the best two of the varnish test pieces in this series.
(3) 18.20 18.37 28.96 35.68
30 18
25.20 17.50
12.04 16.71 16.71
5.68 7.65 DAYS TO RESULTS (4) APPLY 30 MONTHS 5 5 14.48 (8.68) 5 8.92
13.70 (5)
4.73 3.28
3.37 (6) 3.71
1 2
3 3
3 3 to as low as £8.68.
(distinction) PASS
** *
** ** **
** **
(*) Manufacturers suggest 3 to 4 coats; this would bring down the cost per m2
** ** **
7 SIKKENS CETOL FILTER 7
App Three coats, the second de-nibbed lightly in preparation for the third coat. The 3-coat system spanned three days. 30 months Intact on surface and three edges; lower level of sheen than Cetol Marine. Budget (DIY shop) alternative that will be fi ne on traditional workboats where a high gloss fi nish isn’t so appropriate.
8 SADOLIN ULTRA TWO-TIN
App Three coats: one Ultra ‘base coat’, two Ultra top coat. Second coat de-nibbed lightly. Three-coat system took three days. 30 months Totally intact on all surfaces; retains a high level of sheen and good translucence. It has the best level of sheen/ low gloss that we’ve so far found in an exterior woodstain.
6 SIKKENS CETOL MARINE (now International Woodskin) 9 SADOLIN ULTRA SINGLE-TIN
App Three coats (Ultra topcoat only), the second de-nibbed lightly. Three-coat system spanned three days. 30 months Totally intact on all surfaces; It is performing exactly the same as the 2-tin version. It retains a high level of sheen, and good translucence. Like the two-tin version, an extremely worthwhile budget option.
CLASSIC BOAT APRIL 2012 79
(**) Sikkens Cetol Marine is now (from 2011) rebranded as International Woodskin; Filter 7 is unchanged
PASS PASS
PASS PASS
PASS PASS PASS
PASS PASS
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