I have a Toyota Cross and originally purchased a genuine Toyota car cover.  It lasted about 1 year before the sun weakened the fabric to the point that it started to shred.  I then did some research and purchased a heavier duty 3 layer fabric called Sensiron that was suppose to have a three year life.  Well it is less that 1 year and it to has become brittle started to crack and separate.  The car is under a car port roof with only the rear of the car getting sun throughout the morning.  That is exactly where the fabric is damaged and shredding. 

Is there another fabric that someone is aware of that will hold up better to the Thailand sun? 

Maybe extend the car port.

as a long term solution. 

Car port with roller blind or garage. 

Those silver cover things are no good IMO unless they keep clear of the vehicle like a tent.

 

The blind is going to be renewed soon after 10 years of sun. 

 

They should all handle the sun, unless total krap.   Wind might be a different story, as the ones I've attempted to use, got blown off the car.  And not really worth the hassle for me, to secure tightly.

 

As stated, carport at home, and shade when possible when out & about.

You need heavy duty acrylic fabric same they use for boats and also coat it regularly as well take up Kwasakis advise. Or just extend you car park.

Lazada 250bt lasts 3 months then change it cheap enough the only downside is the Mrs uses the scarp parts to cover everything outside to resemble Steptoe's yard ????

https://www.lazada.co.th/shop-automotive/sabai-cover/?spm=a2o4m.pdp_revamp.0.0.7f4e1bc4OUW6Y7