Deck and wood sealant, Costs vary from $13 to $62

[Howard Manning]

Hello, anyone use wood preservative lately.  I find that costs range from about $13 per gallon to over $60 per hour.  I  need to apply sealant to a tennis club house where the owner wants to save the siding and decks for about 2 or 3 more years when he plans to do a total make over.  The siding is a rustic look barn siding and the wood is beginning to peel and splinter badly.  He doesn't want to spend much,  but just make it last a couple more years.  Any info on your experience with this kind of stuff would be appreciated.  Thanks