Good day Steve,
This , Plaid /Folk Art N0 817(this No only) acts like kind of ... stain... with aging and wooden effect at same time... I think it will not mask the weathering You did already , but did it more natural appereance /boost effect ... before You will use it on the model, first better try somewhere on piece of plastic... as You know, in the begining ,I try to use dry pastels...it works also ,may be with similar effect,but more complicate in use...than later on I accidentally found this medium , and say - Yes! that what I need! :)))
nice wooden color(like mast on the replica picture You posted recently) , which I like very much , results in combination of :
1. 1st,basic layer -"sand "or "light grey" of any acrylic paint which better to apply by air brush - this should be totaly cover plastic origin
2. Plaid/Folk Arts caramel(Terre de sienne naturel*Caramelo) paint No 452 - this you better apply by artist brush ,apply smal portion slightly deluted with water...in this stage paint could remain partialy transparent , do not need to try to cover surface totaly and mask complitely basic layer...each next layer need to be applied after drying of previous one- smth.abt 20 min...
3.than ,better next day , I used to apply this Plaid/Folk Arts medium No 817 for creating "wooden" effect - this medium also need to be applyed by artist brush mixed in small portion with water...first I used to dip brush in water ,than dip brush in medium No 817, than apply on surface which I want to be "woodened"... depth of the wooden effect will vary depending on medium No 817 concentration...if you didn't like result, medium could be easily removed by wet (water)brush before it became dry(approx 10-20 min) and process could be repeated...
Plaid have other aging medium ,like natural brown etc. ... but for me, the best was this , No817...(in combination with Caramel 452 as primary(second) layer as I told above)
All the best!
Kirill
ps
Plaid have color "wrought iron" - nice looks on surface! can use for painting"metal" parts on your model.