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Scrit
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I doubt that it's v@rn!sh. V@rn!sh has a tendency to craze in baking environments such as the inside of a van so I'd hazard a guess at either pre-catalysed lacquer or acid catalysed lacquer with an 80% or higher gloss level. Automotive people tend to use acrylic base for the high gloss and it is sprayed on in multiple coats to get that "deep gloss" look, but you can get off the shelf spray cans of clear gloss lacquer at car paint suppliers such as Autopaint. To repair an area you need to sand with wet and dry to somewhere around 600 or 800 grit, wash out the repair area with thinners (degreases and get rid of contamination) then spray the damaged area with several light coats through a template mask (piece of card with a hole cut through it to diffuse the spray edge and allow feathering in). Only spray two coats in a session the allow the area to dry. Denib between spray sessions with a Scoth grey or maroon finishing "cloth" (very fine Scotchbrite pads sold for the purpose - Machine Mart do an equivalent if you can't find them elsewhere). If the build is too high, rub out with 1000 or 1200 grit wet and dry with a small amount of soapy water as a lubricant. Finally rub out with a mop on a drill (1000 to 2000 rpm) and some Farecla cutting compound (or 3M or T-Cut) and buff off. You may find it needs three or four sessions to build the depth of finish. You will find that the repair spray patch grows as you add to the coats..... Essentially it's just like doing a high gloss finish on a car body.
Scrit
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