Thanks people!

Some good thoughts there.

Roger, you're right...although Opunake is out nearest 'town', (it boasts a Post Office,) it has a population of about 1500.
We are about 15 miles from there in the Rahotu area...and Rahotu 'town' has a population of about 100. (And that would include the dogs.)
New Plymouth is our nearest town of any size, population around the 30,000 mark, about an half-hour drive for me...three-quarters of an hour for someone who's not a local, and doesn't know the road.
So sorry pepi, a good idea, (and yes; we do have Yellow Pages!) but it would be horrendously expensive for us to get anyone out from New Plymouth to install a retro-fit lining...an hour and a half of travelling time on top of materials and labour...ouch!
We're in New Plymouth virtually every week for essential supplies, (read beer,) and next time we're there I'll go look for some adhesive spray.
I've already got thumb tacks, (drawing pins we call them,) and I'm pretty sure it'll be a combination of those two ideas that I'll use.

Thanks for your time and ideas fellas!
All good.

.